On top of my post above, I gave a try with Amiga Forever 2012. Disk.info is present in AmigaForever Android subdirectory, as well as one of the paths you mention. Same behavior as with 3.5 : install starts, >>>>>>>>>>>>> then in the end after quite some time "Internal Error". (I can not ensure this "quite some time" means copy was completely finished or aborted before the end as no log is displayed)
Note I'm using 3.1 A1200 ROM
In the end, I'd like to use OS35 files which I owned from my old A1200T/Blizzard040 instead of doing it with "not officially obtained stuff" like AF2012 for obvious reasons.