floppy_overlays_dir
The option documentation is properly formatted yet
Default: [base_dir]/Floppy Overlays Example: path/to/floppy/overlays/dir
Floppy overlay ADFs (sdf) are saved in floppy_overlays_dir. The default is (My) Documents/FS-UAE/Floppy Overlays
Source: https://github.com/FrodeSolheim/fs-uae/blob/master/docs/options/floppy_overlays_dir