How to give Administrator full permisions on all files

I have a personal WD 3TB Cloud that I want to store multiple files at one time!

I get this error "You'll need tp provide Administrator Permission to copy this file folder"

I have tried several methods to get Administrator permission for all files but none of will work!

Tully

Thanx:

What I need on my network, I am the only one on the network, is for me, as the Administrator to have full control of all files on the network!

I can do this, but after a restart, it reverts back to the old permissions set-up.

Tully

Potentially you can brick the system some folders and files must be owned by system giving admin full rights breaks security and would spread malware as suggested use one folder