Copy/paste slots to merge looks nonviable?

[m-7761]

King's Field.mcr.zip

I'm finding success porting this game to Windows/PlayStation VR. But I have save games that I want to use with emulators/mcr. I think this tool could be more user-friendly, but in this case (attached) it seems not to be possible to add a save game from one file to another, that already has 2 saves from the same game...

I did copy pasted (with format step) and renamed the ID to 3. Still, in the emulator, only the last/added save is detected.

No offense, but it would be good if there were simply two panels, for 2 cards, and moving saves between them works like the PlayStation's utility. I was able to use MemCardRex to get the save off of a PS3 reader, and I'm grateful for that. But how can I use it for this? Thanks :)

EDITED: For background the RetroArch emulator in both memory card modes (one is emulated by the PlayStation module) seems to modify the MCR file when it runs (it doesn't have to be saved to) so to remove the save games that it doesn't display in the game, suggesting that it doesn't understand the MCR file saved by MemCardRex.

[m-7761]

Never mind: libretro/beetle-psx-libretro#175 HOW INSANE. Sorry!