Nexus 4 files not showing up in Windows Explorer.

So I brought a nexus 4 almost one month ago and I am fairly satisfied with it but there is this one annoying problem that I have been having lately. I was recommended by a user to factory reset of my phone for some reasons so I have decided to backup my phone before I reset it. The problem is that some of the files are not showing up in the Windows Explorer. I downloaded quite a lot of videos today and they don't appear in the Windows Explorer when the phone is connected through the USB. I checked the files through ES Explorer and they are there but they don't show up which is weird. Are there any suggestions on what I can do to solve them? Thanks