Thank you for using Apple Support Communities. It's my understanding that you're unable to send pictures or videos using iMessage or text messages. I'm happy to help.
If the behavior continues, reinstall iOS with iTunes. This can resolve possible software issues. When reinstalling iOS, iTunes will completely remove your current software and install a fresh version. While iTunes will try to do this without removing data, it's a good idea to make sure you have a recent backup before trying this step. How to back up your iPhone, iPad, and iPod touch