So I found a way around using .m3u files to handle file changes for multi-disc Amiga games. and therefore multi-disc loading.
This requires adding the game’s .adf files to a .zip archive and including “(MD)” in the name of this archive. The archive can then be used by Retrobat/RetroArch without having to change floppy disks.
In summary put the 2 adf or more in a single folder, then compressed this file grouping all the disks.
when compressed renamed it to include (MD).
example: operation wolf disk1 + operation wolf disk2 ,
1-create a wolf operation folder
2- drop the two files there.
3- then compressed this file, on the snapshot, therefore zipped wolf operation. [ example: operation wolf.zip
4-The renamed operation wolf(MD).zip is then necessary
--To access the emulator you must press the central round button if xobx controller and button A,
delve into the menus and activate the multidisk if it was not.