video upload problems

I'm uploading four.MP4 video files for an important client meeting. Two of them uploaded with no problem, but for the other two I am getting this error:

The two files that spark this error are over 2GB, while the other files are under 2GB. That's the only difference I can discern. I don't any file size limit listed in the documentation. Has this happened to anyone else? I have a support ticket in for this--it's something our COO wants posted as soon as possible--but I'm wondering if anyone here has insight on what might be going wrong. Thanks! We're on 10.2.