Folder owner is not contactable and has been deleted as an External User

I am now the admin of the account (I was not initially), and am trying to fix the folder structure of the account (starting by creating a 'Master' [root] folder and moving all folders there).

I have a folder that I can access because I am an Editor in that folder, but I cannot move it as I am not the Owner (or Co-owner). The Owner of the folder is not contactable and has already been deleted as an External User.

I see from other threads that I, as admin, should be able to log in as this user, make myself the co-owner, and then make the changes I need after that, but I can't find anything explaining how I do that (and can't see anything in the Admin Console). Also, is this still an option if the the user has been deleted?

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