My Tiled Tilemap Isnt working properly!

I am trying to make a Third-person shooter and the good things first! I got my Tiled tilemap imported into GDevelop successfully. But that’s about it, the inaccessible blue water tiles arent even visible, i can walk, wait its not even walking but gliding, right through any part of the terrain even if they have collision shapes. Can someone please tell how i got the whole thing wrong and what to do about it?

From my experience tilemaps are very tricky. Make sure all the necessary files (including the atlas image) are all there. I recommend looking for a youtube tutorial.