Can't add new media files

[rvmeush]

I believe I have found the solution to the problem. The solution is described at https://github.com/jellyfin/jellyfin/issues/11528. It talks about changing the Jellyfin DOTNET_SYSTEM_GLOBALIZATION_INVARIANT to 0 as opposed the setting of 1 in the Jellyfin configuration data.
I did this change and now my videos are being detected by Jellyfin library scans, and the movies seem to play correctly.
This fix might be useful for others as well.