truly your english is not the best, when you ask, make it more specific please otherwise dizzy and me running stupid for answers . and mostly for what games do you need it...
''When you say to try to use the save file from end of Disc 1 and copy the data files to the Disc 2 folder''
This will work for everything, emulator, PSP PS2 PS3 or what ever, you have a Explorer where you can copy or delete files, like multiman.
This will answer mostly everything
''swap discs, I have to use my phone or PC to connect to the PS3 via webMAN MOD''
my gosh, Yeah this is fucking reddit, dont read this stupid shit.
Go into explorer and search for your PSX save folders and copy the data files to the Disc 2 save data folder. but remeber this will not work for metal gear, but will work for resident evil 2 or chase the express.
maybe you have luck and there is a Fixed PSP Eboot for you. give names...
are there any multi-disc PS2 games ?? never heard of it