Renamed MP3 file corrupted in iCloud Documents on Mac

I haven't found any other solutions than Readdle for extracing audio from a video on the iPhone, so I used a video file generated by the iPhone's Screen Recording feature and exported it from the iPhone's Photos app to the iCloud Drive “Documents” folder in the iPhone's Files app. While there's no problem as long as I stay on the iPhone, the strange behavior occurs in the same way once on the Mac: the file appears, disappears, and seems corrupted because it is unreadable.

(Now, since my videos are synced between the iPhone and the Mac via Photos, I don't need to transfer them any other way and for the sound files, I'll use Google Drive or Dropbox)

I ran some more tests: no problem with PDFs exported from the Notes app to Documents (either on the iPhone or the Mac). But the same strange behavior occurs when the PDF comes from the Spark email client (from Readdle) on the iPhone, whereas it works fine when using Gmail or Dropbox.

I conclude that there is probably a problem between Apple and Readdle applications. However, this does not explain why audio or video media sent to Documents from the iPhone's Photos app cannot be used in the Documents folder on the Mac. Perhaps Apple prefers us to use Photos for image media and Apple Music for sound files when it comes to transfer them between iPhone and Mac… For some time now, it seems that they don't like to see this kind of file loose in folders. I'll live with that !

Monterey 12.7.6 (Mac Pro Late 2013) & iOS 18.7.1 (iPhone SE 2023).

It wasn't the original screen recording file (which is actually a video). I extracted the audio from this video using a Readdle iOS tool and sent the result to both iCloud Documents and Google Drive. I can't say for sure about the version in Documents because I didn't open it before renaming it. But the one I also sent to Google Drive before renaming it had no problems with its original name, even after being renamed.

Thanks.

Thanks for the advice. I repeated the same procedure and rechecked the files, but got the same result in most cases:

Sending the file converted by Readdle Documents to Google Drive using the Readdle Documents sharing feature works perfectly, but when sending to iCloud Drive, the same thing happened several times in a row:

The file briefly appears in the iCloud Drive Documents folder, then disappears, alternating between appearing for a moment and then disappearing permanently. And it is not possible to play it with QuickTime Player.

I repeated the process several times, and it was only after the fourth time that the file no longer disappeared and was playable.

I don't know if iCloud Drive always behaves this strangely with files coming from environments other than Apple's, but I do know that I will no longer use iCloud Drive to store my own files. I will only use iCloud for syncing iMessages, Photos, and Notes, which seems to work well.