Originally Posted by
Weston@HPTuners
Thanks for the report. Usually, if it's happening to longer videos but not shorter ones, then it's either due to low storage space (and sometimes the system seems to block extra space that would appear to be available; this may be related to pending/downloading updates), or it's just a time thing and it will take longer for the video to finish it's migration into the photo album. The way iOS makes us do things, we have to render the whole video into our own space, and then ask iOS to make a new copy that gets placed into the photo album, so that takes both extra time and temporarily uses 2x as much space.
If it's something more, then I would venture a guess that it probably has more to do with the version of iOS than the new phone itself, but I can investigate further and see if I can reproduce the problem on any of my iOS devices here...