Substance Painter Doesn’t Save Fill Layer Correctly; Also sometimes the layer is unresponsive

In this example I created a simple box.

1. Add a fill layer

2. Add black mask

3. Add paint under the mask

4. Use Arrow Bent for the Alpha and the Greyscale

5. Paint it. It appears on the box.

6. Save it as a Dummy.spp.

7. Load a different project.

8. Close out the project.

9. Load the Dummy.spp.

10. Both the alpha and the greyscale no longer have anything in them (see below).

This is repeatable and is very frustrating.

Second issue is random. I don't know if it requires a complex model or not, but sometimes I am unable to put ANYTHING in either the Greyscale or Alpha (or Alpha will take an image but the greyscale will not).

These two issues are very frustrating.