I see that you posted but cannot find the post here in-thread.
I will respond to what I have in email notification.
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The username “Plex” is not used anymore. The new username is “PlexMediaServer”. This is how it must be on DSM 7 (Synology forced changed)
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User “PlexMediaServer” is a “System Internal User” not a regular user. Please refer to the User Class selector in the upper left corner.
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If your goal at this point is to perform a full restart, erasing everything:
a. Delete user Plex
b. Delete the Plex share (at minimum, delete “Library”) . Media in the Plex share is fine. We don’t care about it anymore.
c. Install the DSM 7 package but do not start.
d. Uninstall the DSM 7 package and “Erase All” – removes all trace of DSM 7 PMS.
Before doing this, I strongly recommend reading the migration procedure.
It’s not difficult but IS extremely detailed. Every step must be performed as written. When done this way, which the installer will also prompt you along the way if it finds a discrepancy, DSM 6 installations do successfully migrate to DSM 7.
The Migration procedure is the second post in the “DSM 7 Forum Preview” thread.