There's an option when editing a post, or a + sign next to a short editing box, to give you access to controls for either taking a photo or uploading one from your photo album (if you grant it access).
Me? Right now I am having a hilarious time wrestling with hacks to my LG Smart TV. It's scary how much these things are computers now. I'm downloading and configuring apps from github that can be setup on a USB drive to extend and override the Plex application controls on the TV. Man, TVs have gotten so complicated now...