When you load a GTA: San Andreas save file with 100% completion, you gain access to several exclusive gameplay rewards and features that aren't available during a standard playthrough: Infinite Ammunition
A: This is for San Andreas, not GTA V. There is zero risk because GTA: San Andreas has no online multiplayer (except modded SAMP/MTASA, where you should NOT use single-player saves). When you load a GTA: San Andreas save
Documents\Rockstar Games\GTA San Andreas Definitive Edition\Profiles\
.b file (e.g., GTASAsf1.b).Copy the downloaded .b file and paste it into that folder. then transfer the files.
A: No. Mobile saves use a different encryption. However, you can convert it using a "SA Save Editor" on PC first, then transfer the files.