How to save Favoritos?

I Export the file with kurviger Format nur cant import to
Unexpected File Content when importing Favorites

(Debug information, this helps us helping you, you can remove this if you don’t want to share this data, it should not contain any personal or sensitive information)
Device: OnePlus - ONEPLUS A6003 - Android: 11 - WebView: 113.0.5672.163
App-Version: 3.0.10 - 1134
Screen: 384 x 811 px - 2.8125dppx

Favorites should be exported in .gpx format.