Photos - uploading to Walgreens (or other site where can't drag) & Shared Album - will pics not in my library transfer?

When trying to upload pics to Walgreens on their site, when I select "Photos" I get my entire photo library - so each individual pic shows up, but NOT the photos sidebar of folder options. I'm wanting to select a "Shared Album."

Shared Album question - pics that didn't come from my photo library won't transfer to a desktop file folder so thinking they won't upload for copies to be made from Walgreens?