Large video transfer

Depends how large:

• Airdrop
• Email if it is under 5 GB using→Mail Drop
• Sync through iCloud if both phones are logged in to the same Apple ID
• Sync using any other cloud service (Google One/Google Photos, Dropbox, box.com, etc)

By storing it in GoogleDrive / Dropbox or similar apps, then sharing it with your correspondent(s).

Regards

Giulio