download photos to computer

I have M Pro, Galaxy s7, Windows 7 computer. The manual seems extremely sketchy about how you get pictures/videos from the drone to your computer or phone. In my early attempts I took long videos when I thought I was taking a still, and previously was able to see them on my phone. Now I got "SD...

I have successfully downloaded jpg files from from my Mavic to my iPhone using the DJI GO 4 app and transferred them to my Mac using Photo Stream. However, when I connect my Mac directly to the Mavic USB port, using the micro USB cable, I can open find the jpg and mov files but cannot transfer...