flash_memory_dir
The option documentation is properly formatted yet
Default: [base_dir]/Flash Memory Example: C:/Amiga/Flash Memory
CD32/CDTV flash memory files are stored in flash_memory_dir. The default is (My) Documents/FS-UAE/Flash Memory.
Source: https://github.com/FrodeSolheim/fs-uae/blob/master/docs/options/flash_memory_dir