The symbols appear on every scenario, and since I was kinda confused with it, I figured maybe someone else got confused.

The first symbol means the photos you need to take (the ones from the boards)

The second symbol are the collectibles you need to find through the map (statues, flowers, etc.)

The third and last symbol are all the extra cameras, drones, paper planes, etc, that you find in the map.

I hope this helps someone :)