On an LG V30 with 64GB internal memory I wanted to be able to use a 200GB SD card (which strangely gets reported as 256GB) to store larger amount of data like pictures, music and movies.
I learned that with Lineage OS 16 (Android 9 Pie) you cannot use your SD card as before since apps are no more allowed to write data to SD cards (is there an Apple manage working at Google now?!)
I then formatted my SD card as "internal storage" (believing that it now extends my 64GB to 200GB) but there doesn't seem to be a way to move arbitrary date to this new "internal storage".
So my (still very fuzzy) question is: is there a way to use an SD card to store arbitrary (i.e. not owned by one app) data like a
Pictures etc. folder (which might be synced automatically by Syncthing or similar apps)?
(extra question: can formatting an SD card as internal storage be undone?)