My usual post on the topic .... since the file size is getting chunky (and you already have the game split into two parts) as an alternative to splitting the game up like that you could just make RPA files of the pictures used in the various sections as those take up the most space. It would allow someone to just drop the archives into a spot the game can find them, and not have to deal with save transfers and the like when it gets chunky. Also let's the players have access to the full story and all replays from start to finish
As another dev pointed out this doesn't really work if the coding is changed heavily between versions but if the concern is android locking out the install folders so it's a pain in the ass to add files... most of the porters on f95 have been adding secondary folders (in documents usually) where the game looks for files (including saves) that puts it outside the locked area for Android.
Anyway thanks for the update