Is there a way to add a .MP4 or .MOV video taken from an iPhone to a page?
Hey, welcome to the Sparkle community!
There is, yes. After you get the video to the Mac, just select the widget “Video” and then choose “From disk” on the options menu.
Yes you can, the available video formats are here described https://sparkleapp.com/docs/videos.html
Hope that helps.