Using iMessage, both my iPhone and iPad can send any type of messages fine. On my Macbook, iMessage can only send text messages. If I try sending a photo or video through it, it hangs on the progress bar for a few minutes before finally giving me the red exclamation mark next to the not delivered photo/video. This has become so regular and consistent, I have to airdrop anything I want to send others, from my Mac to my iPhone and send it that way, and then delete the file back off my camera roll. It's a convuluted process. Something is broken. I've signed out of iMessage on my computer and back in. I've went into the Library and deleted the .db files. Restarted the computer. Nothing is fixing this. Has anyone else experienced this, and more importantly, have you discovered a solution to what should be one of the most basic functions on this computer?