What's the preferred method for exporting a heightmap as a normal map?

I made a test material with thick industrial paint, using a basic mask on the height channel. Trying to export the mat's height as a normal. What's the preferred method? 

Currently I'm trying to convert the height mask to normal data using the "height to normal" filter, but selecting it closes the menu (see attached). Is it broken or is this user error? If broken, is there another way I can convert the height data to normal?

Using Substance Painter 8.3.0