I am unable to edit photos in PhotoShop CS6 from the Photos Media and have it show in the Photos app on OS X. The photo still shows as the original. How do I open a photo from the Photo app, edit it, and save the results?
You will have to ask Apple how that works.
Photoshop opens what it is asked to open, and saves the edits back to the file. All you have to do in Photoshop is save after editing.
After that, it is up to Photos to show the changes correctly.