I can't open tic carts in the android app because my device doesn't recognize the files
I was just trying to figure this out myself and put a suggestion on https://itch.io/t/1818926/where-do-i-put-carts-on-android#post-7132064
The app should have an Android intent that lets other apps, such as a file manager or the web browser after download, share a .tic file to it so you can open files that way. Not sure if the app also needs file system permission with that or if the intent system just passes the object without necessitating that (probably?) Or the app could have file system permission and create the TIC-80 folder at /storage/emulated/0/TIC-80 instead. That way users can copy files from another machine and play them.
I had this problem trying to run Westwood's Bladerunner on my SDCARD through Scummvm but it now works. There was a config file for Scummvm in which if I typed in the number that represents the SDCARD eg /storage3543-6543/ (which is unique to every setup) then it could access. Maybe a pain but if someone is coding on android and you included in the zip for android a text file instructions for using SDCARD by creating a config file the user could edit this might be an acceptable solution idea?