This is related to Dropbox on three different android tablets, 2 Samsung, one other
Android versions 14 and 15. Dropbox is the latest version from Play Store
mp3 files are played in the Dropbox default mp3 player when clicked. This works correctly for mp3 files in the cloud
However: -
Make the mp3 files available off line and the default player wont play the file. The player opens, but the 'play' button is ineffective and the music duration box shows --/--.
The same offline files can be played with third party apps using the "Open With" dialog .
This is a new problem as of Oct 27th 2025. Off line files have always played correctly up to now
I prefer to use the default player as it has the features I like.
MIG