I have a Samsung Galaxy S5 (SC-04F). It has a stock ROM, not rooted, recently upgraded to Android 6.0.1.
After upgrading to Android Marshmallow, No application seems to be able to add, remove, or edit files on the external SD card. For example, Dropsync, can not download files to the SD card, n7player can not remove music files, QuickPic can't move or edit pictures. These are just examples... no app on my phone seems to be able to access the SD card.
Reading files is okay. n7player can play music, and Quickpic can view images, but no app can make changes to the SD card.
If I connect the phone by USB to either my Linux or Windows computer, I can add or remove files from the SD card just fine.
I tried reformatting the SD card, and that didn't change anything.
Whenever I try to take action on a file from within any app, I'm always given this screen:
I follow through by pressing "Got it", and then I am shown the following interface:
Unfortunately, though, nowhere in this interface can I find any option to change permissions on my SD card, or even act on it in any way at all.
In the top left, there is a three dot icon, and if I press it, it gives me the alternate options of either "Show SD Card" or "Hide SD Card". However selecting either option changes nothing.
How do I make my SD card available for use by the apps on my phone?