This is similar to posts about other recent UI changes (example: https://community.dynatrace.com/t5/Dynatrace-Open-Q-A/Auto-Tag-UI-Change/td-p/186682)
Under Settings > Web and mobile monitoring > Map IP addresses to locations
The UI has changed to no longer accept CIDR notation or bulk updates via file, which seems like a large step backwards. In addition, we can no longer sort the mapping rules as we could previously and the Latitude/Longitude values don't match what we entered. I share the negative reactions in other posts to these UI changes that are losing functionality seemingly without feedback.
The documentation still refers to the old UI setup and options: https://www.dynatrace.com/support/help/how-to-use-dynatrace/real-user-monitoring/setup-and-configura...
@BenjaminGT I know you're aware of the Product Idea already, but for others who might find your thread but not the Product Idea's, here's the link: https://community.dynatrace.com/t5/Dynatrace-product-ideas/Import-geographic-regions-from-CSV-file-o...
Just to add to @techean suggestion, you can also send feedback to the documentation team via the Feedback button that can be found at the bottom of the documentation pages.
I've already submitted feedback regarding the currently documentation for this topic 🙂