I am having a very similar issue to this post here: How to flatten the collider for a tilemap?
I want to be able to make the tilemap collider flat and not the shape of the tiles. I followed the suggestion in the post above by editing the sprites and that gives me the offset that I needed but not a flat collider, it is still the shape of the sprite.
This is the tilemnap collider in the scene view:
This is the sprite edited as explained in the post above
Any help is appreciated, thank you in advance