I'm trying to use custom alphas I made to use them as stamps on objects, however when I select any of these, and try to use the airbrush with stamp drag mode, nothing happens - no effect on object whatsoever. I tried other modes like constant pressure, and had the same result.
When I switch to one of the default alphas, it seems to work fine.
Another thing I noticed is that in my custom alphas, the depth controller looks to be set to 0 in the cursor, and I cant control it with ctrl+right click. However the depth input in the ui is not 0. (see image)
What am I doing wrong here?