I haven't had this problem until today.
I import an MP4 file into Audacity.
I deleted the opening and the dead space at the end.
Everything plays fine and I export it as an MP3 file.
Quicktime plays the new file.
However when I import it into Apple Music, I see the file and if I Get Info, it has the correct length. However it will not play when I press the Play button. And maybe this is significant, but it won't open in VLC either.
Exported MP3 file won't play in Music
Forum rules
This forum is for Audacity on macOS 10.4 and later.
Please state which version of macOS you are using,
and the exact three-section version number of Audacity from "Audacity menu > About Audacity".
Audacity 1.2.x and 1.3.x are obsolete and no longer supported. If you still have those versions, please upgrade at https://www.audacityteam.org/download/.
The old forums for those versions are now closed, but you can still read the archives of the 1.2.x and 1.3.x forums.
This forum is for Audacity on macOS 10.4 and later.Please state which version of macOS you are using,
and the exact three-section version number of Audacity from "Audacity menu > About Audacity".
Audacity 1.2.x and 1.3.x are obsolete and no longer supported. If you still have those versions, please upgrade at https://www.audacityteam.org/download/.
The old forums for those versions are now closed, but you can still read the archives of the 1.2.x and 1.3.x forums.
Re: Exported MP3 file won't play in Music
I'm a Windows user so I probably can't help but, have you tried a different format? Do you need MP3?
If you can stick-with MP4 (AAC), it's much less prone to accumulated damage from multiple generations of re-compression.
If you can stick-with MP4 (AAC), it's much less prone to accumulated damage from multiple generations of re-compression.