Thank you Hans De Smaele.
The workaround works with Adobe Bridge for me.
This workaround should not be necessary. Serif should release software that works with existing programs, not insist that others developers adapt to them. This seems especially true as I suspect that many Serif users call Affinity from other programs such as Adobe, DxO, RawTherapee, etc. Seems obvious to me that this would be advantageous to Serif. Why would other vendors want to make it easy to access Serif software. If Serif wants to isolate its software, then I think it needs at a minimum to include a Browser similar to Adobe Bridge.