Plex manual server synology update keeps forever "processing. Please wait..."

@Yorditje

Are you upgrading a large library from 1.21.0.3744 or upgrading from DSM 6 ?

If so, you just need to let it run.

When upgrading from 1.21.0.3744 → any version 1.22.4.4973 or above, it is moving your data to the new PlexMediaServer shared folder.

If you interrupt it, you stand the high likelihood of corrupting it all.

This change was implemented when DSM 7.0 became final release.