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I had the same problem. Then I watched the video and see that the upload is a video file not an audio file, so I uploaded as an MP4 and it worked. Seems like some sort of weird bug.

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Doesn't seem like a bug at all.

They probably need to watermark the output video to clarify that the video is not original and is 'tampered' with.

The software is warning the user that it (rightly) refuses to watermark the video ... of an audio file.

The error message doesn't provide any sort of insight into whether or not that's the case. Contrary to that, the upload box says "Audio or Video File, up to 100MB". So that would imply that they aren't accepting only video input. While I agree with your suggestion that the reason why they seem to be accepting only video files is based on watermarking the output, the upload box seems to accept an audio file input. They should say "We only accept video file input". It's possible they accept audio-only files for higher level paid plans where you can uncheck the watermark box in the Advanced options.

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