David,
I think the fastest way to have an empty mxd open, while you have an mxd open with all your layers. Drag and drop a layer into your empty mxd, upload it, remove it from your mxd, drag and drop the next layer into your empty mxd... and so on. This will keep the symbology.
Hope this helps!
This is only possible if you have an organizational account.
Brilliant. I think that will work. I'll give it a try and report back.
Thanks,
David.