Fix a failed upload

If a video won’t upload, walk through this checklist — most upload problems are fixed in under a minute.

1. Check the error message

Dubly shows specific messages for the most common upload failures:

Message you see	What to do
”Only mp4 and mov files are accepted”	Your file isn’t MP4 or MOV. Convert it to H.264 MP4 and try again.
”File is too large. Maximum size is 5 GB”	Export a compressed H.264 MP4 at 10–15 Mbps — quality stays high, file shrinks.
”Upload failed. Please try again”	Temporary network glitch. Retry the upload.
”Failed to generate upload URL. Please try again”	Retry. If it keeps failing, contact support.

If you’re uploading via a YouTube link:

Message you see	What to do
”YouTube URL is required” / “Please enter a valid YouTube URL”	Paste a youtube.com/watch?v=... or youtu.be/... link. Playlists and Shorts URL variants aren’t always recognized.
”Video not found”	The video is private, deleted, or region-restricted. Make it public or unlisted, or upload the file directly.

2. Confirm the basics

Before retrying, check the file:

• Format: MP4 or MOV. Dubly doesn’t accept MKV, WebM, AVI, or audio-only files.
• Size: under 5 GB.
• Has audio: the video must have a spoken audio track.
• Not corrupted: try playing the file in QuickTime or VLC. If it won’t play there, it won’t upload. See Supported Input Formats for the full reference.

3. Try a fresh upload

The uploader doesn’t support resume — if you refresh or the connection drops mid-upload, progress is lost and you have to start from zero. For large files over slow connections, make sure:

• You’re on a stable network (wired or solid Wi-Fi, not mobile data).
• The browser tab stays open until the upload completes.
• You have a fresh browser session — close and reopen if the tab has been open for hours.

4. Browser-specific checks

If the upload dialog doesn’t open, the progress bar never moves, or the drag-and-drop zone doesn’t react:

• Update to the latest version of Chrome, Safari, Edge, or Firefox.
• Disable browser extensions that intercept uploads (ad blockers, VPN extensions).
• Try an incognito / private window.
• Try a different browser once.

5. For YouTube links

If YouTube upload fails:

• Copy the link directly from the video’s address bar, not from a “Share” button (some share buttons add tracking parameters that break the parser).
• Confirm the video is Public or Unlisted — Private videos cannot be accessed.
• If the video has region restrictions or age restrictions, download it first and upload the file directly instead.

6. Still stuck?

Contact hello@dubly.ai with:

• The exact error message (or screenshot)
• The file size and format (or the YouTube URL)
• The browser you’re using
• A rough timestamp when you tried We can check the server logs directly and get you unstuck.