# My file will not upload

Four usual causes, each with its own message: the file is over your plan’s per-file limit (200 MB and 60 minutes on Free, 1 GB and 2 hours on paid), it is a WAV or FLAC on the Free plan (lossless uploads are paid), the format is not a supported audio format (video is rejected), or you have used up your monthly upload allowance, which resets with your billing month.

For an oversized file — and for a lossless file on Free — the same move fixes both: re-export it as a 320k MP3. An hour of audio lands well under every limit, and transcription and editing work the same on it.

For a video, extract the audio track and upload that. And a file rejected as empty really is empty — zero bytes of audio — so re-export it from wherever it came from.

## Related

- [How do I get my audio into Cast?](https://mubert.com/tools/cast/docs/import-audio)
- [What do the plans include?](https://mubert.com/tools/cast/docs/plans-and-limits)
- [I hit a limit — what now?](https://mubert.com/tools/cast/docs/limit-reached)

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Source: https://mubert.com/tools/cast/docs/file-wont-upload · Cast docs
Last updated: 2026-07-14