I downloaded Android file manager on my macbook air and it still did not recognize my S7 edge. What's up
Android file transfer hasn't been updated in years. Try Samsung Smart Switch. You can find it in the Playstore.
You installed Android File Transfer?
Did you also pull down your notification shade and change the "mode" for your phone? You need to change from charge mode to one that allows for file transfer. This notification only shows up once the phone is plugged in.
See these screenshots from my Nexus 6P:
View attachment 249370
View attachment 249369
Look at the bottom of my notification shade in the first image, tap that and you get the dialog in the next image.
I'll try it too. Your screen shot didn't show up.
I believe I've got that on my phone. Does it also have to be installed on the Mac?