First off, I'm on Verizon and use the stock messaging app. The way I send short videos is go into the stock messaging app, choose the person I want to send the video to or create a new message (if I don't currently have a convo going with them), then I touch the paperclip in the top right, touch video, then touch camcorder and record the video from there. I've had it work hit and miss with previously recorded videos, but it's worked 99% of the time i've initiated the video recording thru the messaging app.