Multisite Upload Path (4.1 new install)

Setting up a new install of multisite. I’d love to have uploads for my main site go to img.domain.com. I am running a subdomain install and have set up both the wildcard subdomain as well as the separate img.domain.com in cpanel.

I have also set the upload path as home/usr/public_html/img
and address https://img.domain.com. Problem is whenever I upload media using the built in tools, the file is not uploaded. I don’t get an error message and wordpress creates a blank thumbnail, but if you browse to the file it does not exist. The img subdomain is provisioned and files work if I FTP files in the folder.

Am I missing something on the .htaccess file? I blacklisted the img subdomain in the network manager as well, so wordpress won’t think it’s another site in the network.

I’ve seen similar threads but they all concern version 3.5 and earlier and don’t seem to apply to the changes in he upload process in more recent versions. I appreciate any assistance!