Some long video files are too large to send in a standard text message. You can use AirDrop, iCloud, or Mail Drop to send long videos that you record with your iPad camera.
The simplest way to send a large video to a nearby iPhone, iPad, Mac, or Apple Vision Pro is with AirDrop > System Settings, then click General in the sidebar. Click AirDrop & Handoff, then click the pop-up menu next to AirDrop and choose Everyone.
Go to the Photos app on your iPad.
Tap the video you want to send, then tap on your iPad.
Tap the video you want to send, tap Apple Support article: Mail Drop limitsImport and export photos and videos on iPad