enter the img tool, if u dont have: https://play.google.com/store/apps/details?id=by.lsdsl.gta.imgtool
then select "open IMG", find
the gta3.img file (this is in the DATA of gta sa, not OBB) select, then click on the
3 dots in the top/right corner, select (add files and replace), and
go where the mod is, look for the folder "gta 3.img" and choose "all", then "select".

now exit, get the files from this folder (except gta 3.img) and paste them all into the folder
root of DATA (not OBB) of GTA SA