diff --git a/src/dialog/browser/browser.ts b/src/dialog/browser/browser.ts
index 528fd06..2e908a9 100644
--- a/src/dialog/browser/browser.ts
+++ b/src/dialog/browser/browser.ts
@@ -60,7 +60,7 @@ export class ProviderBasedBrowserDialog implements BrowserDialog {
         const parsed_path = path.parse(file_path)
         this.dirs.storyfile = parsed_path.dir
         this.dirs.working = '/usr/' + parsed_path.name.toLowerCase().trim()
-        await this.dialog!.update_direntry(this.dirs.working)
+        this.dialog!.update_direntry(this.dirs.working)
         return file_path
     }
 
diff --git a/src/dialog/browser/common.ts b/src/dialog/browser/common.ts
index 46fcaea..741376b 100644
--- a/src/dialog/browser/common.ts
+++ b/src/dialog/browser/common.ts
@@ -11,12 +11,12 @@ https://github.com/curiousdannii/asyncglk
 
 import path from 'path-browserify-esm'
 
-import type {Provider, DirBrowser, FileData, DirEntry} from './interface.js'
+import type {DirEntry, FileData, FilesMetadata, Provider} from './interface.js'
 
 export class NullProvider implements Provider {
     next: Provider = this
     async browse(): Promise<DirBrowser> {
-        return new CachingDirBrowser({}, this)
+        throw new Error('A NullProvider should not be browsed')
     }
     async delete(_path: string) {
         return null
@@ -24,6 +24,9 @@ export class NullProvider implements Provider {
     async exists(_path: string) {
         return null
     }
+    metadata(): Promise<FilesMetadata> {
+        throw new Error('Cannot get metadata from NullProvider')
+    }
     async read(_path: string) {
         return null
     }
@@ -40,32 +43,23 @@ interface NestableDirEntry extends DirEntry {
 }
 
 /** A caching directory browser that receives the list of files once and remembers for as long as the dialog is open */
-export class CachingDirBrowser implements DirBrowser {
-    files: NestableDirEntry = {
-        children: [],
-        dir: true,
-        full_path: '/usr',
-        name: 'usr',
-    }
+export class DirBrowser {
+    files!: NestableDirEntry
     provider: Provider
 
-    constructor(files: Record<string, FileData>, provider: Provider) {
+    constructor(files: FilesMetadata, provider: Provider) {
         this.provider = provider
-        for (const [file_path, meta] of Object.entries(files)) {
-            if (file_path.startsWith('/usr/')) {
-                const parsed_path = path.parse(file_path)
-                const dir_entry = this.cd(parsed_path.dir)
-                dir_entry.children!.push({
-                    dir: false,
-                    full_path: file_path,
-                    name: parsed_path.base,
-                    meta,
-                })
-            }
+        this.update(files)
+    }
+
+    async add_files(files: Record<string, Uint8Array>) {
+        for (const [path, data] of Object.entries(files)) {
+            await this.provider.write(path, data)
         }
+        this.update(await this.provider.metadata())
     }
 
-    async browse(dir_path: string): Promise<DirEntry[]> {
+    browse(dir_path: string): DirEntry[] {
         if (!dir_path.startsWith('/usr')) {
             throw new Error('Can only browse /usr')
         }
@@ -91,4 +85,25 @@ export class CachingDirBrowser implements DirBrowser {
         }
         return dir_entry
     }
+
+    private update(metadata: FilesMetadata) {
+        this.files = {
+            children: [],
+            dir: true,
+            full_path: '/usr',
+            name: 'usr',
+        }
+        for (const [file_path, meta] of Object.entries(metadata)) {
+            if (file_path.startsWith('/usr/')) {
+                const parsed_path = path.parse(file_path)
+                const dir_entry = this.cd(parsed_path.dir)
+                dir_entry.children!.push({
+                    dir: false,
+                    full_path: file_path,
+                    name: parsed_path.base,
+                    meta,
+                })
+            }
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/dialog/browser/download.ts b/src/dialog/browser/download.ts
index d75f434..e5adeda 100644
--- a/src/dialog/browser/download.ts
+++ b/src/dialog/browser/download.ts
@@ -11,8 +11,8 @@ https://github.com/curiousdannii/asyncglk
 
 // The download provider stores its own files just in a map (maybe to be cached in the future), but if files are written next to them, then they need to be done so in another provider
 
-import {NullProvider} from './common.js'
-import type {DirBrowser, DownloadOptions, ProgressCallback, Provider} from './interface.js'
+import {DirBrowser, NullProvider} from './common.js'
+import type {DownloadOptions, FilesMetadata, ProgressCallback, Provider} from './interface.js'
 import {utf8decoder} from '../../common/misc.js'
 
 export class DownloadProvider implements Provider {
@@ -53,6 +53,10 @@ export class DownloadProvider implements Provider {
         }
     }
 
+    metadata(): Promise<FilesMetadata> {
+        throw new Error('Cannot get metadata from DownloadProvider')
+    }
+
     async read(path: string): Promise<Uint8Array | null> {
         if (this.store.has(path)) {
             return this.store.get(path)!
@@ -178,6 +182,16 @@ export async function read_response(response: Response, progress_callback?: Prog
     return result
 }
 
+/** Read an uploaded file and return it as a Uint8Array */
+export function read_uploaded_file(file: File): Promise<Uint8Array> {
+    return new Promise((resolve, reject) => {
+        const reader = new FileReader()
+        reader.onerror = () => reject(reader.error)
+        reader.onload = () => resolve(new Uint8Array(reader.result as ArrayBuffer))
+        reader.readAsArrayBuffer(file)
+    })
+}
+
 function url_to_path(url: string) {
     if (url.startsWith('https:')) {
         return '/download/https/' + url.substring(8)
diff --git a/src/dialog/browser/interface.ts b/src/dialog/browser/interface.ts
index 4b878f7..71caa03 100644
--- a/src/dialog/browser/interface.ts
+++ b/src/dialog/browser/interface.ts
@@ -11,6 +11,8 @@ https://github.com/curiousdannii/asyncglk
 
 import type {AsyncDialog} from '../common/interface.js'
 
+import {DirBrowser} from './common.js'
+
 export type ProgressCallback = (bytes: number) => void
 
 export interface BrowserDialog extends AsyncDialog {
@@ -36,17 +38,14 @@ export interface Provider {
     delete(path: string): Promise<void | null>
     /** Check if a file exists */
     exists(path: string): Promise<boolean | null>
+    /** Get all file metadata */
+    metadata(): Promise<FilesMetadata>
     /** Read a file */
     read(path: string): Promise<Uint8Array | null>
     /** Write a file */
     write(path: string, data: Uint8Array): Promise<void | null>
 }
 
-/** Browse a directory; may cache all the files or request each time you change directory */
-export interface DirBrowser {
-    browse(path: string): Promise<DirEntry[]>
-}
-
 export interface DirEntry {
     dir: boolean
     full_path: string
@@ -54,6 +53,8 @@ export interface DirEntry {
     meta?: FileData
 }
 
+export type FilesMetadata = Record<string, FileData>
+
 export interface FileData {
     atime: number
     etag?: string
diff --git a/src/dialog/browser/storage.ts b/src/dialog/browser/storage.ts
index 2fbd3e3..22d03b1 100644
--- a/src/dialog/browser/storage.ts
+++ b/src/dialog/browser/storage.ts
@@ -11,10 +11,10 @@ https://github.com/curiousdannii/asyncglk
 
 import {decode as base32768_decode, encode as base32768_encode} from 'base32768'
 
-import {CachingDirBrowser, NullProvider} from './common.js'
-import type {DirBrowser, FileData, Provider} from './interface.js'
+import {DirBrowser, NullProvider} from './common.js'
+import type {Provider} from './interface.js'
 
-type WebStorageFileMetadata = Pick<FileData, 'atime' | 'mtime'>
+//type WebStorageFileMetadata = Pick<FileData, 'atime' | 'mtime'>
 
 const METADATA_KEY = 'dialog_metadata'
 
@@ -40,8 +40,8 @@ export class WebStorageProvider implements Provider {
 
     async browse(): Promise<DirBrowser> {
         if (this.browseable) {
-            const metadata = this.get_metadata()
-            return new CachingDirBrowser(metadata, this)
+            const metadata = this.metadata()
+            return new DirBrowser(metadata, this)
         }
         else {
             return this.next.browse()
@@ -67,6 +67,10 @@ export class WebStorageProvider implements Provider {
         }
     }
 
+    metadata() {
+        return JSON.parse(this.store.getItem(METADATA_KEY) || '{}')
+    }
+
     async read(path: string): Promise<Uint8Array | null> {
         if (path.startsWith(this.prefix)) {
             const res = this.store.getItem(path)
@@ -93,13 +97,9 @@ export class WebStorageProvider implements Provider {
         }
     }
 
-    private get_metadata(): Record<string, WebStorageFileMetadata> {
-        return JSON.parse(this.store.getItem(METADATA_KEY) || '{}')
-    }
-
     private update_metadata(path: string, op: MetadataUpdateOperation) {
         const now = Date.now()
-        const metadata = this.get_metadata()
+        const metadata = this.metadata()
         switch (op) {
             case MetadataUpdateOperation.DELETE:
                 delete metadata[path]
diff --git a/src/dialog/browser/ui/FileDialog.svelte b/src/dialog/browser/ui/FileDialog.svelte
index c5487f6..881c226 100644
--- a/src/dialog/browser/ui/FileDialog.svelte
+++ b/src/dialog/browser/ui/FileDialog.svelte
@@ -1,6 +1,7 @@
 <script context="module" lang="ts">
     import type {Filter} from '../browser.js'
-    import type {DirBrowser, DirEntry} from '../interface.js'
+    import type {DirBrowser} from '../common.js'
+    import type {DirEntry} from '../interface.js'
 
     export interface PromptOptions {
         dir_browser: DirBrowser
@@ -12,11 +13,14 @@
 </script>
 
 <script lang="ts">
+    import {read_uploaded_file} from '../download.js'
+
     import AlertDialog, {ALERT_MODE_CONFIRM, ALERT_MODE_PROMPT} from './AlertDialog.svelte'
     import BaseDialog from './BaseDialog.svelte'
     import DirTree from './DirTree.svelte'
     import FileList from './FileList.svelte'
 
+    let upload_files: HTMLInputElement
     let alert_dialog: AlertDialog
     let base_dialog: BaseDialog
     let cur_dir: string
@@ -37,7 +41,7 @@
         }
     }
 
-    export async function prompt(opts: PromptOptions): Promise<string | null> {
+    export function prompt(opts: PromptOptions): Promise<string | null> {
         dir_browser = opts.dir_browser
         if (opts.filter?.extensions.join() !== filter?.extensions.join()) {
             if (cur_filter !== '*') {
@@ -50,7 +54,7 @@
         }
         saving = opts.save
         submit_label = opts.submit_label
-        await update_direntry(cur_dir)
+        update_direntry(cur_dir)
         const promise = base_dialog.open(opts.title)
         file_list.clear()
         if (saving && filename_input) {
@@ -62,10 +66,10 @@
         })
     }
 
-    export async function update_direntry(path: string) {
+    export function update_direntry(path: string) {
         file_list.clear()
         cur_dir = path
-        cur_direntry = (await dir_browser.browse(path)).sort((a, b) => {
+        cur_direntry = (dir_browser.browse(path)).sort((a, b) => {
             if (a.dir !== b.dir) {
                 return +b.dir - +a.dir
             }
@@ -74,6 +78,19 @@
         dir_tree = path.substring(1).split('/')
     }
 
+    async function check_overwrite(filename: string) {
+        for (const entry of cur_direntry) {
+            if (!entry.dir && filename === entry.name) {
+                return !!(await alert_dialog.open(ALERT_MODE_CONFIRM, 'Overwrite file', `Are you sure you want to overwrite ${filename}?`))
+            }
+        }
+        return true
+    }
+
+    function on_add_file() {
+        upload_files.click()
+    }
+
     function on_change_dir(ev: CustomEvent) {
         const path: string = ev.detail
         update_direntry(path)
@@ -117,19 +134,32 @@
     async function on_submit() {
         if (saving) {
             const filename = filename_input.value.trim()
-            for (const entry of cur_direntry) {
-                if (!entry.dir && filename === entry.name) {
-                    const overwrite = await alert_dialog.open(ALERT_MODE_CONFIRM, 'Overwrite file', `Are you sure you want to overwrite ${filename}?`)
-                    if (!overwrite) {
-                        return
-                    }
-                }
+            if (await check_overwrite(filename)) {
+                base_dialog.resolve(filename ? cur_dir + '/' + filename : false)
             }
-            base_dialog.resolve(filename ? '/' + dir_tree.join('/') + '/' + filename : false)
         }
         else {
-            base_dialog.resolve('/' + dir_tree.join('/') + '/' + selected_filename || false)
+            base_dialog.resolve(selected_filename ? cur_dir + '/' + selected_filename : false)
+        }
+    }
+
+    async function on_upload_files() {
+        if (upload_files.files) {
+            const files: Record<string, Uint8Array> = {}
+            let have_files = false
+            for (const file of upload_files.files) {
+                if (await check_overwrite(file.name)) {
+                    files[cur_dir + '/' + file.name] = await read_uploaded_file(file)
+                    have_files = true
+                }
+            }
+            if (have_files) {
+                await dir_browser.add_files(files)
+            }
         }
+        upload_files.value = ''
+        // Update the current file list
+        update_direntry(cur_dir)
     }
 </script>
 
@@ -146,6 +176,10 @@
         flex-grow: 1;
         margin-left: 6px;
     }
+
+    #add_file {
+        display: none;
+    }
 </style>
 
 <BaseDialog
@@ -154,11 +188,10 @@
     max_height=500px
     max_width=700px
 >
-    {#if saving}
-        <div class="actions">
-            <button on:click={on_new_folder}>New Folder</button>
-        </div>
-    {/if}
+    <div class="actions">
+        <button on:click={on_add_file}>Add file</button>
+        <button on:click={on_new_folder}>New Folder</button>
+    </div>
     <DirTree
         dir_tree={dir_tree}
         on:change_dir={on_change_dir}
@@ -196,5 +229,6 @@
             {/if}
         </div>
     </div>
+    <input bind:this={upload_files} id="add_file" type="file" multiple on:change={on_upload_files}>
     <AlertDialog bind:this={alert_dialog}></AlertDialog>
 </BaseDialog>
\ No newline at end of file