If transfer of multiple files fails, there is no quick way to resume transfer by skipping duplicates

Large bulk file transfers (total number of files and/or amount of data) frequently fail because of the the lack of error recovery in MTP (I'm not sure if is a bad physical cable connection, the limited write speed of the destination device, limited buffer space, the mobile device changing power mode). At the very least, restarting the bulk file transfer should have an option to skip files that have already been transferred (with the known caveat that MTP can't do checksum comparisons, so there is the potential hole that you have a corrupted file of the exact same name and size... and that isn't carried over... but I think most people are willing to accept that small risk for speed in most cases.