I have an Oklahoma CDL and I lost it at a truck stop in Oklahoma. Can I still drive with just a photocopy of my driver license?
I would inform the authorities about that loss as soon as possible (consider that your lost license could be found by a criminal who then conveniently "loses" it during a bank robbery), and ask them how to get a replacement license as soon as possible.
That website actually recommends having a copy of your CDL with you at all times, or your company should have a copy on their files they can fax to you, so it would seem legal to drive with a copy.
There is a difference between "driving license" in the sense "the permission given to you by the state to drive a car on public roads" and "driving license" in the sense "a piece of paper or plastic giving evidence that you have permission to drive". In most countries, driving without license is a serious offence, while driving without the piece of plastic is a minor offence.