Cannot paint on tiled landscape?

Not sure if there is something else I have to setup or what but I cannot paint grass, trees, any foliage, etc… on my tiled landscape.

Is there something I have to do to combine all the tiles or something else?

Haven’t really found information about this so any help would be appreciated!

bump…

When does this happen? Is your landscape suddenly getting untextured or can’t you even begin to paint on textures?

can’t paint on it period and i have experienced it losing the textures sometimes as well

still have not solved this issue :?

Did you guys manage to solve it?? im having this problem please help