I'm having an issue with my Z740/radiant where it plays music fine from internal memory, but it won't from the SD card. I've used both the default music app ("Music") and Jetaudio Basic, and neither finds any music files on the SD card. Jet Audio doesn't even appear to see the card when I click on the file tab in the app. The default player doesn't appear to have a folder icon I can click on in the app to browse for files.
The files are visible from a file manager app I have. I can click on the files from the file manager and bring up the default music player (choosing from the list of apps that pops up), and the file plays. If I try to do the same thing with JetAudio, the app briefly comes up, but bounces back to the file manager before playback starts.
I tried to clear the app data for both apps to force music rescan, and that didn't help.
This SD card appears to play well with the phone in other respects. Apps run from it fine. Is there a way to evaluate that further?
Unfortunately, this phone has such limited internal memory to start with that it is basically useless as an audio player unless I can get the SD card to work for audio.
EDIT: This phone has Android 4.2.1.
The files are visible from a file manager app I have. I can click on the files from the file manager and bring up the default music player (choosing from the list of apps that pops up), and the file plays. If I try to do the same thing with JetAudio, the app briefly comes up, but bounces back to the file manager before playback starts.
I tried to clear the app data for both apps to force music rescan, and that didn't help.
This SD card appears to play well with the phone in other respects. Apps run from it fine. Is there a way to evaluate that further?
Unfortunately, this phone has such limited internal memory to start with that it is basically useless as an audio player unless I can get the SD card to work for audio.

EDIT: This phone has Android 4.2.1.
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