No GPS track visible in gpxpod (although present in the folder)

Hello, I just installed nextcloud 11 on my web server and installed gpxpod. I uploaded a few gpx files (in a new folder). When I launch gpxpod and select this folder, it is briefly scanned and nothing happens (no visible track). I know that these tracks are good: I can visualize them on other websites. I even downloaded one gpx and uploaded it there, from the web. Same result. There's probably an issue somewhere in the setup, but I can't figure out where. The only change I made to the default installation: I enabled serverside encryption. Do you have any idea why the folder is not scanned properly?

Have a nice day