After a long time of perfect upload, today I had problem with one exercise. I got Server error 500 when uploading tcx file manually. Automatically, exercise was not visible.

Original file was from smart trainer and app TrainerDay (formerly ERGdb). It is loaded into Strava and Garmin Connect without any problems. Original file is here:

https://drive.google.com/file/d/1WEG8zRYoUML_tK1WdDlQMvhW0Nx4SpPf/view?usp=sharing

I found that if I load file to Garmin and export it from there, it can be loaded to the Exhaust. Distance is missing, but I can live with that.

Only difference I found between original and garmin file is a few tab stops at the first and third lines before actual xml tag.