In Affinity Designer on iPad, I can't type the '+' or '_' characters using my Bluetooth keyboard. Some notes on this:
1. I *can* type '+' and '_' using an onscreen keyboard
2. I *can* type '-' and '=' using the Bluetooth keyboard, but the corresponded shifted versions don't work.
3. the + and _ characters work everywhere else on my iPad using the Bluetooth keyboard, just not in Affinity Designer.
4. I have the same problem in Affinity Publisher
5. Sometimes the '_' character makes the text in the text box disappear (or turn white?), which makes me think that '_' is configured to do some other action in Affinity Designer. I can't figure out exactly what it's doing though.