I have the Galaxy S6 & have been transferring files from the cell to my PC (& vice versa) with WebDAV server. It has worked great for thousands of files. But it doesn't work for large files. I have transferred small video files just fine. But I have some video files that are 80-300MB. When I try to transfer them, it says, "cannot read from the source file or disk" & it lists the file name, type (.mp4), size & date mod. The way I copy is to run WebDAV server. Then on my PC, I access the cell drive in windows explorer. Then do copy (ctrl-c) & paste (ctrl-v). They are also too big to email to myself. How can I get them onto my PC? Thanks so much.