How to make animated background bunker bits ?
I made all the frames for FG BF and Mat bunker block.
But when i add FrameCount, SpriteAnimMode and SpriteAnimDuration parameters game crash on loading screen.
I know its possible to make somehow, theres animated screen in tutorial map, but i cant figure out how they made it.

Oh, that is a MOSParticle animated with .Lua, it isn't part of the BG. So yeah, for animations, pinned objects are pretty much the only way to go.