Gimp-Forum.net

Windows 10
Gimp 2.10.2 from gimp.org

I can't find a way to to do a bump map.

In the Bump Map dialogue I can't change the option that says Bump Map RedLayer-3 ([Untitled]). It is not a drop-down or anything.
Me being stupid? Or a bug?

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EDIT: OK, me being stupid. It is the Aux Input.

You got it, but it is worth a couple of screenshots for newcomers.

As Blighty wrote, it is the Aux Input icon



Once you have the mask selected, nice on canvas adjustments.