Thanks Bagginsbill. Maybe it's not staying attached because I'm adding the bump map in the simple palette rather than the advanced one (?). Hm, will have to experiment.

Edit: But that doesn't really make sense, as I'm not having this problem with the main colour map, and I added that via the simple tab....

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3