Is there any way to edit a photo once it is in the “library”? Rotate, delete, etc?
Delete, yes, in very limited circumstances:
- ‘Allow media deletion’ option is enabled in Server/Library settings. (Plex web)
- The user logged into Plex is the same user used to log into the server. (Settings/Server/General)
If the above are true, that user, and only that user, will have the option to delete individual media files.
Aside from that, Plex made a deliberate decision to never touch/edit your files in any way. Plex is meant solely as a means of presentation for your media, not editing.