(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: samsung - SM-G996B - Android: 13 - WebView: 114.0.5735.196
App-Version: 3.0.10 - 1134
Screen: 384 x 854 px - 2.8125dppx
Can you share the file you are trying to import?
Maybe there is something wrong with the filename.
Filename should end with .gpx or .kurviger.
And the golden rule for filenames in IT is still valid Avoid filenames with spaces or special characters.
Best to use only ASCII characters i.e. 1-9, a-z, _ - .
Anything else is risky.
That GPX is in Garmin format. Workaround: Open it on gpxshaping.de, select desired route, save it as GPX only with track and import it in Kurviger.
Result for 1st route: https://kurv.gr/TudEM