Phantasy Star (Master System)

Hi all, I recently downloaded the emulator for Phantasy Star (for the Master System) and have been playing it on the app "Fusion364".
All was fine for a week or so as I progressed along and saved progress as I went along. However the other day wehn I went to load the programme it had lost all my saved gaming!
I tried starting again (much to my pain!) but, even though it appeared to "Save" fine, when I restarted Fusion it had lost all my saves!

Can anyone help me with what I need to do - I don't mind starting again - as long as I can save the darned thing - and stop my swearing at the game! :D

Cheers
Emjay