Use a wooden dowel… something semi-sacrificial. Get under the paper however you can at a corner and loosen up enough to wrap the circumference of the dowel, plus some. Roll the paper off the sheet and onto the rod.
Ideally the dowel gets thrown away at this point, because it will be an equal fight to get the paper off of it.
This system works to remove the protective paper off of polycarbonate and sheet acrylic, as well as laser-guard type protection IF the edge is sheared.
I still have yet to find a way to not fight every bit of protective paper off of laser cut stainless…
Be safe
Jeremy