Following up on StefanD's post: I have a Samsung S22 in the US
Go to:
Setup - Apps - WhereYouGo - Set as default - Supported web addresses
then turn on "Wherigo.com" and "www.Wherigo.com"
The cartridges now download into the correct folder and open on the app.
Thanks! I just now googled this topic to see if there was a fix for this minor annoyance, and now have some new things to try.
Didn't know about the GeoPrinter addon. I had been typing the GC code into the Personal Cache Note.