I use a 10” Galaxy Tab A6 from the bottom USB port.
It works with the Mavic & Mavic2 but not on my Xiaomi Mi 4K, I have to connect using wi fi for that one.
Can you enable USB tethering on the S7 ?
I don't have that option on the A6 and it is required for the Mi 4k but for some reason it works with the Mavic’s automatically but I have no idea why.