Originally posted by onajourney
You're platinum save didn't work for me. How do I unlock all trophies with it?
People often get confused by that, but platinum save means the save already has the platinum trophy. Meaning all trophies were achieved, so in MOST games at least some trophies would be locked out. Things like collectibles for instances usually can't be picked up again.
Saves like these have a lot of other uses, but they're not for instantly popping your own platinum except in very rare cases.