You will have to edit folder locations because my computer may be different than yours.
Running sa-mp as an Administrator, your screen shots appear here...
C:\Program Files (x86)\Rockstar Games\GTA San Andreas
To get screen shots to appear in your 'GTA San Andreas' folder, do the following.
Right click sa-mp shortcut > properties > advanced > Set, Run as Administrator > OK.
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To find screen shots taken while not running sa-mp as an Administrator, go here... You will have to edit the folder location since my computer is different than yours.
C:\Users\Matt\AppData\Local\VirtualStore\Program Files (x86)\Rockstar Games\GTA San Andreas
