I've just bought a TvBox with Android 10 in it, and i've soon discovered that no app can write on the external HDD/flashdrives i attach to the USB port (seen as /storage/<long_number_here> ).
This is a problem 'cause the internal storage of the TvBox isn't enough for the apps i want to use (KODI is a good example: it generate a lot of thumbnails, taking up much space, but i can't configure it to use the HDD folder 'cause it can't write to it) or 'cause i'd like to use a wifi connection to update the files in the HD (the file manager which provide the connection cannot do anything on the HD).
While i'm not an android/linux expert, i'm not afraid on using ADB, rooting the device if necessary, etc, so i'm asking what should i do to obtain writing permission on every external device i may plug in the USB port.