The drag and drop a photo from the upload menu is part of the software, so you should be able to do that. Maybe I am not understanding what you mean?

Here are 4 easy ways to do the right click from you Mac product:

How to Right Click on a Mac

I think you misunderstand what we are talking about with regard to the iPhone and some other phones. It is about the extra coding that the phone puts into the photo (they are still jpeg), that extra coding is really for the phone to display the photo on the phone regardless of what way you have it turned (even upside down). Great for the phone, but not so great when it uploads the photo, depending on the way you held the phone when taking the photo -- then at times if flips the photo sideways when it is uploaded.