diff --git a/packages/web-api/package.json b/packages/web-api/package.json
index a56989095..b6bd8702c 100644
--- a/packages/web-api/package.json
+++ b/packages/web-api/package.json
@@ -65,7 +65,7 @@
     "source-map-support": "^0.5.21",
     "ts-node": "^10",
     "tsd": "^0.31.1",
-    "typescript": "5.3.3"
+    "typescript": "5.5.4"
   },
   "tsd": {
     "directory": "test/types"
diff --git a/packages/web-api/src/file-upload.ts b/packages/web-api/src/file-upload.ts
index 09ff422ee..2f1548a07 100644
--- a/packages/web-api/src/file-upload.ts
+++ b/packages/web-api/src/file-upload.ts
@@ -235,13 +235,19 @@ export function getAllFileUploadsToComplete(
     if (file_id) {
       const compareString = `:::${channel_id}:::${thread_ts}:::${initial_comment}`;
       if (!Object.prototype.hasOwnProperty.call(toComplete, compareString)) {
-        toComplete[compareString] = {
-          files: [{ id: file_id, title }],
-          channel_id,
-          initial_comment,
-        };
-        if (thread_ts) {
-          toComplete[compareString].thread_ts = upload.thread_ts;
+        if (channel_id && thread_ts) {
+          toComplete[compareString] = {
+            files: [{ id: file_id, title }],
+            channel_id,
+            initial_comment,
+            thread_ts,
+          };
+        } else {
+          toComplete[compareString] = {
+            files: [{ id: file_id, title }],
+            channel_id,
+            initial_comment,
+          };
         }
         if ('token' in upload) {
           toComplete[compareString].token = upload.token;