You are amazing! It works! At least almost all of the time ...
When trying to save a text-file which was opened with open file task in MiXplorer text editor I receive an error message: "couldn't upload! >> content://net.dinglisch.android.taskerm.fileprovider/..." There must be some file access, because after trying to save, the file still exists but is empty. The content is not changed, but deleted completely.
But other text editors work perfectly. I've tested with: Turbo Editor, Amaze Text Editor (built in Amaze File Manager), WPS Office and QuickEdit Text Editor. The files can be edited AND saved.
Opening, editing and saving an xls-File with WPS Office works, too.
Without knowing much of android internals, i'd assume the problem with MiXplorer is there. Knowing that, I can use another text editor (temporarily).
You made it happen! And you made it happen very quickly and your response time was awesome. THANK YOU!