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Not sure if UD can read those.

Unraid must format any disk it will use in the parity array or cache pool.

You mean like this post on this same page? https://forums.unraid.net/topic/51808-support-linuxserverio-letsencrypt-nginx/?do=findComment&comment=745607

I have split this into its own topic. Do you have any other working dockers? Please post your docker run command as already requested.

Mover doesn't do backups or make copies. It just moves.

This seems to be a question about how to setup the plex docker rather than a question about Unassigned Devices. And you haven't told or shown us the most important thing about setting up a docker, your volume mappings. Post your docker run command as explained in this very first link from the Docker FAQ: https://forums.unraid.net/topic/57181-real-docker-faq/#comment-564345 Then I will probably split this to the support thread for the particular plex docker you are using.

Typically, instead of sharing individual disks on the network, you will have "User Shares". Each user share is a "folder" that can span disks. Each user share has settings that control how the user share is managed. While you could have a single user share that contained all the files on all disks, people usually create separate user shares for different purposes, so they can be managed separately. https://wiki.unraid.net/UnRAID_6/Overview#User_Shares

I hope this was a typo since that path is wrong no matter what else. /mnt/user is the user shares.

The database is in your plex appdata so just delete it and reinstall.

See the "Need Help?" sticky pinned near the top of this same subforum for some ideas on how you can get us more information. https://forums.unraid.net/topic/37579-need-help-read-me-first/ If possible, try to get the Diagnostics zip file and attach it to your next post.

On the Dockers page, click on the docker to get to the Update Container page. Then

Your appdata, domains, and system shares are all on cache where they belong. Your docker image is 35G, much larger than necessary. It is extremely unlikely to ever need even 20G unless you have something misconfigured. Have you had a problem filling it in the past? None of this is really about your question, though. I would say just make sure you have backups and if it isn't broke don't fix it.

I think maybe my other questions and that link are the right direction:

That share is also set to cache-prefer, as it should be. This means it will try to use cache for the files. Whether or not all files are on cache is another question. Mover will try to move cache-prefer shares to cache if it can, but any open file can't be moved. What often happens is people add cache after they have already enabled dockers or VMs, with the result that those files are always open and can never get moved to cache where they belong. Go to Tools - Diagnostics and attach the complete diagnostics zip file to your next post.

I think that screenshot means it is working. What "file explorer" are you referring to? How are you configuring which Plex docker to allow it to access? Have you seen this post in the Docker FAQ? https://forums.unraid.net/topic/57181-real-docker-faq/#comment-564314

I think you must be misinterpreting what you are seeing in the webUI. Any drive that isn't mounted will appear as an Unassigned Device. This is true even if you don't have the Unassigned Devices plugin installed. This is not at all the same thing as saying the Unassigned Devices plugin has mounted the drives. Probably the drives became temporarily disconnected for some reason and when they connected again they were Unassigned, since Unraid will not try to remount them. Post a screenshot of what you are seeing, and also go to Tools - Diagnostics and attach the complete diagnostics zip file to your next post. I think there is a good chance your problems have absolutely nothing at all to do with this plugin, so I may split your issue into its own topic after we take a look. I see you already have a thread going about your cache dropping so most likely this is just another symptom of that. If so, I will split this into that thread.

That hardware doesn't really seem appropriate for Unraid. What did you intend to have Unraid do with it?

You might try renaming config/network.cfg on flash to something else. This will make it use the default network settings.

You might check on the plex forums to see it there is any utility to get the information you want from the plex database.

Just so there is no misunderstanding. With single parity, a single failure can be rebuilt from the parity calculation by reading parity PLUS ALL of the remaining disks. Parity by itself protects nothing. And as mentioned, parity is not a substitute for backups, whether in Unraid or some RAID implementation.

Go to Windows Control Panel - Credential Manager and delete any Unraid credentials so they can be renegotiated. Also, see this "sticky" pinned near the top of this same subforum for other ideas: https://forums.unraid.net/topic/53172-windows-issues-with-unraid/

(you should always) Go to Tools - Diagnostics and attach the complete diagnostics zip file to your next post.

Also, see these Update Notes: https://forums.unraid.net/topic/66327-unraid-os-version-650-stable-release-update-notes/

You might just try making a backup of the config folder on flash, then preparing a new install and copy the config backup to that new install.

Tools - Diagnostics. Attach complete Diagnostics zip file to your next post.