If you are looking for specific "paperwork" or guides for this port, they are primarily hosted on these official community platforms: Official Installation Guide: The primary resource for end-users is the gtasa_vita GitHub repository
This digital "manual" contains all control schemes and cheat codes for the trilogy (GTA 3, Vice City, and San Andreas). PG Team Website: The developers of the " Revisited Trilogy gta sa ps vita rom
Since there was no official Vita version, developers in the homebrew scene looked at the mobile version of GTA: San Andreas (originally released for iOS and Android) as the foundation. The mobile version was already optimized for portable hardware and touch controls, making it the best candidate to bring over to the Vita. If you are looking for specific "paperwork" or