The video upload size limit is 20GB. 

Please note the larger the file the longer it will take. 

Most users have decent download speeds but terrible upload speeds. We recommend having you run a speed test to confirm if this may cause an issue.

Here is a link if you want to test your speed:
https://www.speedtest.net

Also if you have a lot of devices connected to the wifi, your speed can be affected. Try disconnecting multiple devices if you are having uploading issues.

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