OK, just had a discussion with my VAR and the drag-and-drop feature DOES work with Edge … it just doesn't behave the same way which is why I thought it didn't work. I expected the upload button to turn into a big gray box like it does for IE. Once I let go of the item I was dragging, it did upload.

For the other issue I'm having (opening the file on task open), I believe it's because my default PDF application has changed from Acrobat Pro to Acrobat Reader. I've put in a Help Desk ticket within my company to see if that can be fixed and if it solves my second issue above. I'll keep you posted!