What error code do you get? I'm with @dianawilson, having a book nearby makes the whole thing way less annoying.

Wait, you were sending actual video files through email? For months? That's wild. My phone would have a meltdown trying to download one of those. No wonder people weren't opening them, they probably crashed their inbox.

So like morgan_stone33's neighbor, do you think people just won't care until they're already in a mess? Is there even a way to get through to them before that?