Save any asset to your device from the iPhone app.
To download assets from the project page, tap the three dots on the asset thumbnail and tap Download Asset. You can then choose where you want to save them.
To download assets from the player page, tap the three dots (menu) in the top right corner and tap Export Asset.
You can also save the video to a shared camera roll album, send it as a text or AirDrop attachment, and upload it to another application on your phone.