@stevetiler
If your iPhone videos gets transferred to your Windows based PC without problems, then that is great. But for the benefit of anyone else who have a bit of a problem, I'll add a little trick here, before I help you with your problem of transferring edited video clip back into iPhone.
Sometimes there are bit of problems with getting a video done on an Apple device (iPhone or iPad) and have it on the PC for editing. Most of the times, problems with uploading, or the video ends up on PC, upside down. Sometimes Apple will export it in a format that PC won't accept. I've had that experience too often. The best way is...
Open
iMovie app (It may be possible to use any other non-Apple apps)
Import the video clip, but don't do any editing, just tap on
Done.
Tap on the
Export icon usually looking like an upward arrow out of a box.
Pick any of the cloud based services you use (Microsoft OneDrive, Dropbox, Adobe Creative Cloud, etc)
This will help turn the Apple format file into a suitable universal video file that the PC can work with, specially getting it on the PC in the right way up.
Now,
@stevetiler I'll help with your problem.
Make sure you export your edited video into an acceptable universal format, in my case, using Adobe Premiere Pro, I export into a .mp4 format.
If iCloud is not working, try to upload to any other cloud based services, like OneDrive, Dropbox, Adobe Creative Cloud, etc. I have those three, you could use Google Drive if you want, or any other of those. Then on your iPhone, go to the other cloud based service, go to the folder where you uploaded to, find the video file, and download it to your iPhone.