Still figuring how to transfer my manga files less painfully but there just seems to be no way with Boyue devices...
MTP/PTP transfer still doesn't work half of the time for me.
So I tried with my USB via OTG. USB is detected ok and is formatted as FAT32 but then Boyue OS starts freezing and bugging out.
I first see the files in file explorer but then when I want to click on one it just start saying "Can't load content at the moment" and then black screen and then Boyue OS crashes.
Boyue why........
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Btw, one thing I noticed and that I found the answer on the internet is that Android 8 has problems when downloading files to SD card via browsers too (like Opera that lets you choose download location on a SD card). The files are downloaded successfully but reported as 0B files in file manager (corrupted). Solution that I found is to reboot the device. Files then appear error free and working. :|