I thought PlexMediaServer had to have Full Control to the media file system for Synology DSM7. I read that in your post here where you say “You want to make certain that user PlexMediaServer has Full Control of all files and folders in the Plex share” Plex Media Server - Synology DSM 7 Preview - Issues ( Archive ) - Plex Media Server / NAS & Devices - Plex Forum. I must have mistakenly assumed it also needed Full Control to the share the media files were on (my bad).
If I can change PlexMediaServer’s permissions to Read/Write to the media share and see if the behavior for MP4 files go away, I am willing to try that. I can also change the ownership to admin:users if that will suffice. I do not have “Allow media deletion” enabled in the Plex Media Server settings, so I can probably change PlexMediaServer to Read-Only if Read-Write doesn’t fix the behavior for MP4 files, right?
