As above. Not sure when this stopped working, but its running the latest version.
Press and hold on a game, click "Compress the Disk" and I get:
"Searching for Games Automatically"
After a few seconds the games re-appear, but the selected game has not compressed.
Tried on multiple games in varying file formats.
Running Xperia Z1 Compact, Android 5.1.1 stock with FPse version 0.11.174.
Help welcome! I've got 14gb of ROMs to compress down .