app Android via HTTPS

[gobanow]

You'd need to add your server cert to your phone's trust store since the Android app has no way to add one locally like the browser does.

yes, I add it to
the Samsung phone, the certificate is not added to the "Security certificates" (trusted certificates), writes "it is impossible to use the file as a CA certificate",
it is installed only in the user certificates "VPN certificate and applications" that does not work, the Jellyfin app does not see it?

where could there be a problem with the certificate?
the OMV certificate itself (, generated from the web interface and signed, was added there and works, but this certificate (Jellyfin) does not want to, I make a mistake somewhere