If you’re facing the frustration of slow upload speeds there are a few things you need to check.
1. Your broadband connection: Check the live upload speed here
2. If possible use the hard line (ethernet cable) instead of your WiFi
3. End or pause any heavy bandwidth consumption items running in other tabs or on your desktop apps such as online games, video streaming / downloading, file sharing services etc.
All uploaded files go through 2 step: Uploading and Processing. Larger files take longer to upload and process.
That said, there is a chance that the speed could be a problem at our end. And if you have checked the above steps and are still experience issues, please contact support.