I have to re-open the program for my sdcard to finally be viewable.
Xperia S, marshmallow.
Still a thing in 3.2.1
I guess maybe you request sdcard access before asking permissions and/or you don't reload "context" once this is granted?
Still a thing on Pie.
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Ok, I think I got the issue (my old devices be damned).
Kernel was probably lacking proper setns support.
Perhaps this can be detected and the user be warned in advance?