Virtual Sites & Mfile

Virtual Sites is UM's 'remote computing' service which allows you access to the programs on UM's computer labs. From their website, "With Virtual Sites, you can use the software on Campus Computing Sites Windows workstations remotely from any Mac or Windows computer with an internet connection."
This includes Photoshop. Please give it try and see how well it works for you. I tried it and it works surprisingly well. It takes a few minutes to load, but once it does it's pretty quick. When you first open up Virtual Sites, you will see the window pictured below. Be sure to change your connection speed to LAN (10Mps) as that most closely matches you connection speed you are likely using.

Here is a document that provides some info on setting things up and using the system. 

Mfile is essentially UM's cloud storage system. You have to upload your files to Mfile in order to access them when using Virtual Sites. Once you have your files on Mfile, the are accessible by clicking the My IFS Space icon on the desktop. This is the only directory to which you should save your work.

Alternatively, you could upload and download your files from any other online service such as M Box or Google Drive, etc...