I am having problems sending a video through Email. My internet provider is century link and my mail is through yahoo. It is too large for my yahoo account so I tried to send it via century link but I keep getting the message that it could not conn

Contact Century Link to verify your email account settings are correct.

Otherwise use your Mail iCloud email account. It has built in support for sending large files in smaller packages that other services that accept, then combine back into a single file.

The video is too large. Most email providers limit the size of emails they will transport. Use online file sharing instead. Or. use snail mail and send a DVD or thumb drive containing the video.

Mail Drop limits - Apple Support

iCloud: Add an attachment to an email