diff --git a/application/F3DStarter.cxx b/application/F3DStarter.cxx
index 6e3a33318b..d77ce352e1 100644
--- a/application/F3DStarter.cxx
+++ b/application/F3DStarter.cxx
@@ -255,7 +255,7 @@ class F3DStarter::F3DInternals
     const std::regex numberingRe("\\{(n:?([0-9]*))\\}");
     const std::regex dateRe("date:?([A-Za-z%]*)");
 
-    /* Return a non empty file related string depending on the currently loaded files */
+    /* Return a file related string depending on the currently loaded files, or the empty string if a single file is loaded */
     const auto fileCheck = [&]()
     {
       if (this->LoadedFiles.size() == 0)
@@ -288,30 +288,32 @@ class F3DStarter::F3DInternals
         return F3D::AppVersionFull;
       }
       // TODO update doc
-      // TODO test multifile
       else if (var == "model")
       {
         std::string output = fileCheck();
         if (output.empty())
         {
-          return this->LoadedFiles[0].stem().string();
+          output = this->LoadedFiles[0].stem().string();
         }
+        return output;
       }
       else if (var == "model.ext")
       {
         std::string output = fileCheck();
         if (output.empty())
         {
-          return this->LoadedFiles[0].filename().string();
+          output = this->LoadedFiles[0].filename().string();
         }
+        return output;
       }
       else if (var == "model_ext")
       {
         std::string output = fileCheck();
         if (output.empty())
         {
-          return this->LoadedFiles[0].extension().string().substr(1);
+          output = this->LoadedFiles[0].extension().string().substr(1);
         }
+        return output;
       }
       else if (std::regex_match(var, dateRe))
       {
@@ -454,7 +456,6 @@ class F3DStarter::F3DInternals
     std::map<std::string, std::tuple<std::string, fs::path, std::string, std::string>> loggingMap;
 
     // For each input file, order matter
-    // TODO add a multifile test
     for (const auto& tmpPath : paths)
     {
       std::string inputFile = tmpPath.string();
@@ -644,6 +645,7 @@ class F3DStarter::F3DInternals
     }
   }
 
+  // Recover a vector of unique parent paths from a vector of paths
   static std::vector<fs::path> ParentPaths(const std::vector<fs::path>& paths)
   {
     std::vector<fs::path> parents;
@@ -787,7 +789,6 @@ int F3DStarter::Start(int argc, char** argv)
         }
         if (keySym == "Down")
         {
-          // TODO add a multifile test
           if (this->Internals->LoadedFiles.size() > 0)
           {
             for (const auto& parentPath : F3DInternals::ParentPaths(this->Internals->LoadedFiles))
@@ -839,7 +840,6 @@ int F3DStarter::Start(int argc, char** argv)
         }
         if (index > -1)
         {
-          // TODO add a multifile test
           this->LoadFile(index);
         }
         this->RequestRender();
@@ -1028,8 +1028,8 @@ void F3DStarter::LoadFile(int index, bool relativeIndex, bool forceClear)
     bool clear = forceClear ? true : this->Internals->CurrentFilesGroupIndex != groupIndex;
     this->Internals->CurrentFilesGroupIndex = groupIndex;
 
-    // Create a nice looking filename info eg: "cow.vtp (1/5)"
-    // Each group contains at least one path
+    // Create a nice looking group index eg: "(1/5)"
+    // XXX: Each group contains at least one path
     std::string groupIdx = "(" + std::to_string(groupIndex + 1) + "/" +
       std::to_string(this->Internals->FilesGroups.size()) + ")";
     this->LoadFile(this->Internals->FilesGroups[groupIndex], clear, groupIdx);
@@ -1125,7 +1125,6 @@ void F3DStarter::LoadFile(
                 static_cast<std::uintmax_t>(this->Internals->AppOptions.MaxSize * BYTES_IN_MIB))
             {
               f3d::log::info(tmpPath.string(), " skipped, file is bigger than max size");
-              // TODO add a multifile test
             }
             else
             {
@@ -1142,16 +1141,18 @@ void F3DStarter::LoadFile(
 
       if (!localPaths.empty())
       {
-        std::copy(
-          localPaths.begin(), localPaths.end(), std::back_inserter(this->Internals->LoadedFiles));
         // Add files to the scene
         loader.add(localPaths);
+
+        // Update loaded files
+        std::copy(
+          localPaths.begin(), localPaths.end(), std::back_inserter(this->Internals->LoadedFiles));
       }
     }
   }
   catch (const f3d::loader::load_failure_exception& ex)
   {
-    f3d::log::error("Could not load files: ", ex.what());
+    f3d::log::error("Some of these files could not be loaded: ", ex.what());
     for (const fs::path& tmpPath : localPaths)
     {
       f3d::log::error("  ", tmpPath.string());
@@ -1167,10 +1168,11 @@ void F3DStarter::LoadFile(
   std::string filenameInfo;
   if (this->Internals->LoadedFiles.size() > 0)
   {
+    // Loaded files, create a filename info like this:
+    // "(1/5) cow.vtp + N [+UNSUPPORTED]"
     filenameInfo = groupIdx + " " + this->Internals->LoadedFiles.at(0).filename().string();
     if (this->Internals->LoadedFiles.size() > 1)
     {
-      // TODO add a multifile test
       filenameInfo += " +" + std::to_string(this->Internals->LoadedFiles.size() - 1);
     }
     if (unsupported)
@@ -1178,6 +1180,7 @@ void F3DStarter::LoadFile(
       filenameInfo += " [+UNSUPPORTED]";
     }
 
+    // Update dmon wtch logic
     if (this->Internals->AppOptions.Watch)
     {
       // Always unwatch and watch current folder, even on reload
@@ -1199,6 +1202,9 @@ void F3DStarter::LoadFile(
   }
   else
   {
+    // No files loaded, create a simple filename info like this:
+    // (1/5) cow.vtt [UNSUPPORTED]
+    // (1/1) cow.vtt [+UNSUPPORTED]
     if (unsupported)
     {
       filenameInfo = groupIdx + " " + paths.at(0).filename().string() + " [";
@@ -1298,6 +1304,7 @@ void F3DStarter::SaveScreenshot(const std::string& filenameTemplate, bool minima
 //----------------------------------------------------------------------------
 int F3DStarter::AddFile(const fs::path& path, bool quiet)
 {
+  // Check file exists
   auto tmpPath = fs::absolute(path);
   if (!fs::exists(tmpPath))
   {
@@ -1307,6 +1314,7 @@ int F3DStarter::AddFile(const fs::path& path, bool quiet)
     }
     return -1;
   }
+  // If file is a folder, add files recursively
   else if (fs::is_directory(tmpPath))
   {
     std::set<fs::path> sortedPaths;
@@ -1323,6 +1331,7 @@ int F3DStarter::AddFile(const fs::path& path, bool quiet)
   }
   else
   {
+    // Check if file has already been added
     bool found = false;
     std::vector<std::vector<fs::path>>::iterator it;
     for (it = this->Internals->FilesGroups.begin(); it != this->Internals->FilesGroups.end(); it++)
@@ -1337,16 +1346,18 @@ int F3DStarter::AddFile(const fs::path& path, bool quiet)
 
     if (!found)
     {
+      // Add to the right file group
       if (this->Internals->AppOptions.MultiFileMode == "all")
       {
         if (this->Internals->FilesGroups.size() == 0)
         {
           this->Internals->FilesGroups.resize(1);
         }
+        assert(this->Internals->FilesGroups.size() == 1);
         this->Internals->FilesGroups[0].emplace_back(tmpPath);
       }
-      else // if (this->Internals->AppOptions.MultiFileMode == "single") XXX more grouping mode may
-           // be added in the future
+      else // if (this->Internals->AppOptions.MultiFileMode == "single") 
+           // XXX more grouping mode may be added in the future
       {
         this->Internals->FilesGroups.emplace_back(std::vector<fs::path>{ tmpPath });
       }
@@ -1354,6 +1365,7 @@ int F3DStarter::AddFile(const fs::path& path, bool quiet)
     }
     else
     {
+      // If already added, just return the index of the group containing the file
       if (!quiet)
       {
         f3d::log::warn("File ", tmpPath.string(), " has already been added");
diff --git a/application/testing/CMakeLists.txt b/application/testing/CMakeLists.txt
index 4364e2c898..3480fa1cea 100644
--- a/application/testing/CMakeLists.txt
+++ b/application/testing/CMakeLists.txt
@@ -191,9 +191,11 @@ f3d_test(NAME TestUTF8 DATA "(ノಠ益ಠ )ノ.vtp")
 f3d_test(NAME TestFilenameCommasSpaces DATA "tetrahedron, with commas & spaces.stl")
 f3d_test(NAME TestFont DATA suzanne.ply ARGS -n --font-file=${F3D_SOURCE_DIR}/testing/data/Crosterian.ttf)
 f3d_test(NAME TestAnimationIndex DATA InterpolationTest.glb ARGS --animation-index=7 --animation-time=0.5 --animation-progress)
+f3d_test(NAME TestMultiInputAnimationIndex ARGS ${F3D_SOURCE_DIR}/testing/data/InterpolationTest.glb ${F3D_SOURCE_DIR}/testing/data/BoxAnimated.gltf --animation-index=9 --animation-time=0.85 --animation-progress --multi-file-mode=all)
 f3d_test(NAME TestAnimationAutoplay DATA InterpolationTest.glb ARGS --animation-autoplay)
 f3d_test(NAME TestMaxSizeBelow DATA suzanne.stl ARGS --max-size=1)
 f3d_test(NAME TestMaxSizeAbove DATA WaterBottle.glb ARGS --max-size=0.2 REGEXP "file is bigger than max size" NO_BASELINE)
+f3d_test(NAME TestMaxSizeAboveMultiFile ARGS ${F3D_SOURCE_DIR}/testing/data/suzanne.obj ${F3D_SOURCE_DIR}/testing/data/WaterBottle.glb --multi-file-mode=all --max-size=0.6 --opacity=0.5)
 f3d_test(NAME TestAlternativeOptionSyntax DATA WaterBottle.glb ARGS --max-size 0.2 REGEXP "file is bigger than max size" NO_BASELINE)
 f3d_test(NAME TestNonExistentFile DATA nonExistentFile.vtp ARGS --filename WILL_FAIL)
 f3d_test(NAME TestUnsupportedFile DATA unsupportedFile.dummy ARGS --filename WILL_FAIL)
@@ -203,6 +205,7 @@ f3d_test(NAME TestNoRenderWithOptions DATA dragon.vtu ARGS --hdri-ambient --axis
 f3d_test(NAME TestNoFile NO_DATA_FORCE_RENDER)
 f3d_test(NAME TestMultiFile DATA mb/recursive ARGS --multi-file-mode=all)
 f3d_test(NAME TestMultiFileColoring DATA mb/recursive ARGS --multi-file-mode=all -s --coloring-array=Polynomial -b)
+f3d_test(NAME TestMultiInputColoringTexture ARGS ${F3D_SOURCE_DIR}/testing/data/mb/recursive/mb_1_0.vtp ${F3D_SOURCE_DIR}/testing/data/mb/recursive/mb_2_0.vtp ${F3D_SOURCE_DIR}/testing/data/world.obj --multi-file-mode=all -sb --coloring-array=Normals --comp=1)
 f3d_test(NAME TestMultiInputPositionals ARGS ${F3D_SOURCE_DIR}/testing/data/mb/recursive/mb_0_0.vtu ${F3D_SOURCE_DIR}/testing/data/mb/recursive/mb_1_0.vtp --multi-file-mode=all -s --coloring-array=Polynomial -b)
 f3d_test(NAME TestMultiInputArg ARGS --input ${F3D_SOURCE_DIR}/testing/data/mb/recursive/mb_0_0.vtu ${F3D_SOURCE_DIR}/testing/data/mb/recursive/mb_1_0.vtp --multi-file-mode=all -s --coloring-array=Polynomial -b)
 f3d_test(NAME TestMultiInputMultiArgs ARGS --input ${F3D_SOURCE_DIR}/testing/data/mb/recursive/mb_0_0.vtu --input ${F3D_SOURCE_DIR}/testing/data/mb/recursive/mb_1_0.vtp --multi-file-mode=all -s --coloring-array=Polynomial -b)
@@ -312,6 +315,8 @@ if(NOT F3D_MACOS_BUNDLE)
   f3d_test(NAME TestConfigFileBuild DATA dragon.vtu CONFIG complex_build.json)
   f3d_test(NAME TestConfigStemBuild DATA dragon.vtu CONFIG complex_build)
   f3d_test(NAME TestConfigFileUpperCase DATA suzanne_upper.STL CONFIG complex_build)
+  f3d_test(NAME TestConfigFileMultiInputSTL ARGS ARGS ${F3D_SOURCE_DIR}/testing/data/mb/recursive/mb_1_0.vtp ${F3D_SOURCE_DIR}/testing/data/suzanne.stl --multi-file-mode=all CONFIG complex_build)
+  f3d_test(NAME TestConfigFileMultiInputVTP ARGS ARGS ${F3D_SOURCE_DIR}/testing/data/mb/recursive/mb_1_0.vtp ${F3D_SOURCE_DIR}/testing/data/suzanne.stl ${F3D_SOURCE_DIR}/testing/data/mb/recursive/mb_2_0.vtp --multi-file-mode=all CONFIG complex_build)
 
   file(COPY "${F3D_SOURCE_DIR}/resources/configs/config.d/" "${F3D_SOURCE_DIR}/plugins/native/configs/config.d/" DESTINATION "${CMAKE_BINARY_DIR}/share/f3d/configs/config_build.d")
   f3d_test(NAME TestDefaultConfigFileVTU DATA dragon.vtu CONFIG config_build LONG_TIMEOUT TONE_MAPPING)
@@ -336,6 +341,7 @@ endif()
 
 f3d_test(NAME TestGLTFImporterUnlit DATA UnlitTest.glb)
 f3d_test(NAME TestMaterial DATA suzanne.ply ARGS --color=0.72,0.45,0.2 --metallic=0.7 --roughness=0.2)
+f3d_test(NAME TestMaterialFullScene DATA WaterBottle.glb ARGS --color=0.9,0.1,0.1 --metallic=0.7 --roughness=0.2)
 f3d_test(NAME TestMetaData DATA pdiag.vtu ARGS -m)
 f3d_test(NAME TestEdges DATA suzanne.ply ARGS -e)
 f3d_test(NAME TestLineWidth DATA cow.vtk ARGS -e --line-width=5)
@@ -385,6 +391,7 @@ endif()
 f3d_test(NAME TestCameraPersp DATA Cameras.gltf ARGS --camera-index=0)
 f3d_test(NAME TestCameraOrtho DATA Cameras.gltf ARGS --camera-index=1)
 f3d_test(NAME TestCameraIndexConfiguration DATA Cameras.gltf ARGS --camera-index=0  --camera-azimuth-angle=15 --camera-position=0.7,0.5,3)
+f3d_test(NAME TestMultiInputCameraIndex ARGS ${F3D_SOURCE_DIR}/testing/data/Cameras.gltf ${F3D_SOURCE_DIR}/testing/data/CameraAnimated.glb --multi-file-mode=all --camera-index=2 --opacity=0.5)
 # Test Verbose camera
 f3d_test(NAME TestVerboseCamera DATA Cameras.gltf ARGS --camera-index=1 --verbose NO_RENDER REGEXP "0:.*1:")
 
@@ -964,6 +971,13 @@ set_tests_properties(f3d::TestInvalidCLIArgs PROPERTIES PASS_REGULAR_EXPRESSION
 # Test that f3d resolution can be controlled from config file
 add_test(NAME f3d::TestConfigResolution COMMAND $<TARGET_FILE:f3d> --config=${F3D_SOURCE_DIR}/testing/configs/resolution.json ${F3D_SOURCE_DIR}/testing/data/suzanne.stl --output=${CMAKE_BINARY_DIR}/Testing/Temporary/TestConfigResolution.png --ref=${F3D_SOURCE_DIR}/testing/baselines/TestConfigResolution.png)
 
+# Test filename template with multiple files
+add_test(NAME f3d::TestMultiFileFileNameTemplate COMMAND $<TARGET_FILE:f3d> ${F3D_SOURCE_DIR}/testing/data/suzanne.stl ${F3D_SOURCE_DIR}/testing/data/dragon.vtu --output=${CMAKE_BINARY_DIR}/Testing/Temporary/{model.ext}.png PASS_REGULAR_EXPRESSION "multi_file.png")
+
+# Test filename template with no files
+add_test(NAME f3d::TestNoFileFileNameTemplate COMMAND $<TARGET_FILE:f3d> --output=${CMAKE_BINARY_DIR}/Testing/Temporary/{model.ext}.png PASS_REGULAR_EXPRESSION "no_file.png")
+set_tests_properties(f3d::TestNoFileFileNameTemplate PROPERTIES ENVIRONMENT "CTEST_F3D_NO_DATA_FORCE_RENDER=1")
+
 # Test failure without a reference, please do not create a TestNoRef.png file
 f3d_test(NAME TestNoRef DATA cow.vtp WILL_FAIL)
 
diff --git a/library/private/window_impl.h b/library/private/window_impl.h
index 12915945c3..0f62a41187 100644
--- a/library/private/window_impl.h
+++ b/library/private/window_impl.h
@@ -70,7 +70,7 @@ class window_impl : public window
 
   /**
    * Implementation only API.
-   * Set the importer on an already created vtkF3DRendererWithColoring
+   * Set the importer on the internal renderer
    */
   void SetImporter(vtkF3DMetaImporter* importer);
 
diff --git a/testing/baselines/TestConfigFileMultiInputSTL.png b/testing/baselines/TestConfigFileMultiInputSTL.png
new file mode 100644
index 0000000000..4c608f224b
--- /dev/null
+++ b/testing/baselines/TestConfigFileMultiInputSTL.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8c05538a8c7247c4172721e1f18580d5edea5d95826b4cec2abc1876a2d6c6d7
+size 34188
diff --git a/testing/baselines/TestConfigFileMultiInputVTP.png b/testing/baselines/TestConfigFileMultiInputVTP.png
new file mode 100644
index 0000000000..a3c83a7e93
--- /dev/null
+++ b/testing/baselines/TestConfigFileMultiInputVTP.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a809177e1d585e86191d8a0755630c5513a854d0916336baf86c1e87878ae600
+size 47999
diff --git a/testing/baselines/TestMaterialFullScene.png b/testing/baselines/TestMaterialFullScene.png
new file mode 100644
index 0000000000..a4df8df4e1
--- /dev/null
+++ b/testing/baselines/TestMaterialFullScene.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:00b992a31481c9838b545b3c469631c21c366d9b0826fde6171b56639859f032
+size 15591
diff --git a/testing/baselines/TestMaxSizeAboveMultiFile.png b/testing/baselines/TestMaxSizeAboveMultiFile.png
new file mode 100644
index 0000000000..9f5dec9678
--- /dev/null
+++ b/testing/baselines/TestMaxSizeAboveMultiFile.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:103fd900202833d926a3662214a6abe92cb3d29af9f2f52d0b8bdb0c529b07ba
+size 21417
diff --git a/testing/baselines/TestMultiInputAnimationIndex.png b/testing/baselines/TestMultiInputAnimationIndex.png
new file mode 100644
index 0000000000..f8822c3462
--- /dev/null
+++ b/testing/baselines/TestMultiInputAnimationIndex.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e788c601396836ab75734bb69ac22ba9605374c12fb635885768fc4e5ef51ebb
+size 4947
diff --git a/testing/baselines/TestMultiInputCameraIndex.png b/testing/baselines/TestMultiInputCameraIndex.png
new file mode 100644
index 0000000000..87f2e42a61
--- /dev/null
+++ b/testing/baselines/TestMultiInputCameraIndex.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ab6326ba1da12c057c1d52e8b3e3bc63ee86c55bb4c81e52126da0224cd42974
+size 3454
diff --git a/testing/baselines/TestMultiInputColoringTexture.png b/testing/baselines/TestMultiInputColoringTexture.png
new file mode 100644
index 0000000000..7a427c02a5
--- /dev/null
+++ b/testing/baselines/TestMultiInputColoringTexture.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ae5299f32b0fb18e6d075dd1a0d2da4d0f56e706d68e99c016ff67280fa9cc27
+size 32236
diff --git a/testing/configs/complex.json b/testing/configs/complex.json
index 7bded1e66c..177d1d77ea 100644
--- a/testing/configs/complex.json
+++ b/testing/configs/complex.json
@@ -7,6 +7,7 @@
   },
   ".*(vt.)":
   {
+    "up": "+Y",
     "bar": true,
     "render.effect.ambient_occlusion": true,
     "filename": true
diff --git a/testing/data/mb/recursive/f3d.glb b/testing/data/mb/recursive/f3d.glb
new file mode 100644
index 0000000000..bdce4cdb98
--- /dev/null
+++ b/testing/data/mb/recursive/f3d.glb
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8f4b8990cb6a45a366a724de79f6c996cc2e92abe6161bd78735780d4a2db5b8
+size 3652