It is really hard to figure out some of the stuff in Pixelmator Pro, I cannot believe how much time I have wasted just trying to figure out how you mask to a vector. Still have not figured it out so as a last resort I decided to se if anyone on the forum can help.
This is something that is drop dead easy in Affinity Photo, in fact drag and drop easy.
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OK, that sounds interesting, does the vector path layer need to be selected in order to do this? I had read somewhere else about doing something like this but could not figure out how to do it. I'll have to try it again.
No*. I think it's just selecting it as rendered pixels, so you can use the usual selection tools and refine the selection (even invert it if you want) before applying it as a mask.
(edit) *If you have Sample All Layers checked. If you don't have this checked then you would have to have the shape layer selected, but that would be true of a pixel layer, too.