I have just upgraded Affinity Photo from version 1.6.x to 1.7.2. In my old version 1.6.x, I created a couple of presets in the Crop tool for fixed pixel sizes, e.g.
3870 x 2580
3702 x 2468
3534 x 2356
Those presets got lost after the upgrade. OK, so I'm going to re-create them in version 1.7.2. But I was not able to do this, no matter what I tried:
1. When I set fixed pixel sizes in the "Unconstrained" mode, then the "Create Preset..." function in the presets drop-dow