When I import a photo from my camera (Canon 5D Mark III) via USB, it comes into my Macbook Pro's Photos App. I have updated to High Sierra on my 2015 Macbook Pro. Importing the pics works fine but if I want to edit them, on the photo, I hit the Edit tab on upper right toolbar, all the functions show in the sidebar below. But choosing one of them does nothing i.e. nothing shows up to edit with, no slider, nothing. I can go down the list from one to other but nothing else is showing up. Is there another step I have to take now in High Sierra to get these edit tools to function?