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as already explained

After you actually get it storing syslog where you have it set to store them, you must actually get it from there and zip it to post it. It isn't included in Diagnostics.

You must also set the Remote syslog server. If you want it to log to itself just put localhost.

Post a screenshot of your syslog server settings.

If any container has a mapping to /mnt/user (or /mnt/disk# or /mnt/poolname), and it creates a folder there, that folder is automatically a user share named for the folder. User shares are the combined top level folders of array disks and pools. If you create a user share in the webUI, Unraid creates top level folder(s) named for the share on array and/or pools as needed in conformance with settings made for the share. Conversely, if you create a top level folder on array or pools, it is automatically a user share named for the folder. This will also happen if you create a folder in /mnt/user, the top level of user shares. If you have a user share named "media", it is at /mnt/user/media. If something references a path at /mnt/user/Media, it is a different user share named "Media". Container mappings are a common way to accidentally create a user share, but anything that creates a folder in /mnt/user (or /mnt/disk# or /mnt/poolname) is creating a user share.

You can download a local zipped flash backup from Main - Boot Device - Flash - Flash Backup. See if that backup method works or has similar problem.

The config folder from your flash backup is all you need to get your configuration going again on a new install. First try with the existing flash drive and if that works you won't have to transfer the license to a new flash drive. You should definitely have a keyboard and monitor attached. You need to be able to see if it is getting to the Unraid boot menu or not, and also be able to boot in SAFE mode.

I would do a 2x2TB mirror Partition 16GB for internal boot, and the rest of the capacity for a pool, maybe even put your docker/VM related stuff there. You need to backup all that anyway regardless of mirrors or parity.

It was spamming syslog in those diagnostics. Do you still have the problem if you disconnect that?

How is that DVD drive connected?

Do you plan to have 2x2TB mirror? What filesystem is on the existing 1TB?

That looks OK too. The only other container you have that I use is DiskSpeed, and it doesn't have any paths except its appdata. What do you get now with this command line? df -h /dev/loop2

That has nothing to do with path mappings. Change what? Typically you don't change container paths, since those are the paths the application expects to use. The host paths are how those container paths correspond to Unraid storage.

That is not the screenshot I was asking for. That information is already in docker run you posted. I am talking about the Transcoder Settings within the Plex application

FYI config/super.dat is your array disk assignments.

Why would you exclude config/super.dat from flash backup?

DVR and transcoding are the only ways Plex should be writing anything (except to its own database in Appdata). Post a screenshot of Plex Transcoder Settings (Show Advanced)

Do any of your containers have a host mapping at the top level of user shares or a disk or pool? Any folder created at the top level is automatically a user share named for the folder. If an application creates a folder at the top level it is creating a user share. Scripts and plugins could also have a path with the capitalized Media in it, so container host mappings aren't the only possibility.

I xxx your claim token. That's a lot of path mappings! Do you use the DVR feature?

Another possibility is you have a mapping to /mnt/user (or /mnt/disk# or /mnt/poolname) and you have the application storing something in Media using that mapping.

Is anything being stored in Media when it gets created?

This doesn't matter. What I was asking for more details about was the part I specifically quoted. This can be interpreted in many ways. Specify number of pools, number of devices in each pool, size of each device in each pool, for both the current and to be configuration.

You must have specified a path to /mnt/user/Media (or possibly /mnt/disk#/Media or /mnt/poolname/Media) somewhere, probably a container host path.

Could you elaborate?