How do I transfer multiple pictures from my Samsung S7 to a computer file?
One option is to connect the phone and computer with the USB cable, pull down the phone's notification shade and change the USB mode to File Transfer, and then 'drag and drop' the files.
Move Pictures / Videos from Device - Samsung Galaxy S7 / S7 edge | Verizon Wireless
Another option is to upload the pictures to a cloud storage (like Google Photos) and then download them to your computer.