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use file chooser for "play media" profile
there is currently a profile for "play media", but there is no file chooser dialog. the path must be typed in manually, and there is no simple way to copy a file's path with the Android file browser.
I found a quick fix for this till another option is availabe, if you use simple file manager(one of simple tools applications on fdroid and google play), you can hold click the file you want to play from, once its highlighted, hit the 3 dot icon on top right and "copy path to clipboard" is available. Paste that on the play media textbox and you are good to go.
Thanks for the suggestion. Indeed, that will be very helpful.
I'm in a constraint of time recently (and in near future), but will look into it if nobody posts a work-in-progress PR.