[ApK]

If your file source has an FTP server, as most NAS devices do, ES's FTP mode is usually faster than it's LAN (SMB) mode. I tend to use that when copying videos and audio books, and while it does take a while, I rarely have a corruption. Rarely, but not never.

Also remember you will NEVER get a file transfer as fast as your link speed. Link speed is a theoretical maximum. Even if you have absolutely no other traffic on the link, file transfers incur overhead at several levels. Not to mention retries and other compensations for dropouts and other connection problems.

If I have very large copies to do, I still prefer to use USB if available. I tend to keep my wifi xfers under 1GB.

And yes, the MTP transfers on most devices always complain about any file type other than a few music and photo formats.