If the error code received is a 400 error, the upload problem is likely due to a weak internet signal. eg. Youtube Error Message: Error Domain=com.google.GDataServiceDomainCode=400.
Why does this happen?
Signal Strength
When a video is uploaded to Youtube, Youtube starts a session. That session has a time limit. When that time limit is exceeded, a 400 error message will be displayed. This is just one example of an error message produced and may not be exactly the same. If the error code is 400 though, it`s likely a problem with the signal strength.
What can I do about it?
Use WiFI and ensure you are close to the source for a better signal
The first thing to do is check the signal strength. Phones connect through cellular internet connections, or through WiFi. Generally WiFi internet connections are stronger and more reliable. There are 2 indicators on the iPhone to indicate signal strength for each the cellular network and WiFi. If WiFi is turned off or there is no WiFi network to connect to, the WiFi signal indicator will not be displayed.

Cellular network: The strength of the cell phone network is shown by 5 vertical bars in the top left of the iPhone`s display. If there are only 2 you may run into problems. If you are trying to upload through the cellular network, try switching to a WiFi network with a good signal
WiFi: Three curved lines in the top right of the iPhone display indicate signal strength. Try to upload when you see all three lit up to avoid problems from a weak signal. Two lines may or may not be OK. If you run into problems uploading through WiFi, check the signal strength and move closer to the source if it looks low.
cDemo recommends using a WiFi network for uploading inspections and videos becuase they tend to be more reliable. Something else to note is that ISP's of all types emphasize download speeds more than upload speeds because that's the direction of most traffic. The upload speeds are much faster than download speeds with most providers.
If you've encountered this problem and have ensured you're uploading through WiFi with a good signal and still have an issue uplaoding, please contact support@cdmeo.com.