Sending videos, whether a Youtube video or one that you recently just filmed on your mobile phone, can be tricky when sending to another number or social profile. Ensure that your mobile service provider can send a particular length-sized video before hitting send. Sometimes the overall duration of the media won't allow it to be sent and will need to be broken into separate files. Also, be sure that you have a strong network connection. Having a weak connection is still acceptable for texts and emails but not for most media files that are high quality or longer than two or three minutes total.