idk about the map part, but for the picture gallery you would do something like:
1) create a sprite then fill the frames with the pics you want.
2) then make a left and right arrow
3) add 2 global variables: Active_frame =0 or 1;frame_count = frames in sprite;
on start of layout/on animation finished >>> set frame_count to sprite.animationframecount
on right arrow click
Active_frame < frame_count >>> add 1 to Active_frame and set sprite to frame: Active_frame
on left arrow click
Active_frame > 0 >>> subtract 1 from Active_frame and set sprite to frame: Active_frame
idk I may make a tutorial vid on this later