how do i post a gif... or a video?

i want to post a video.. or a gif... i really wish i had the option to go live... :/ like live streaming

I would also like to know the answer to this question, if anyone knows.

https://home.ourhome2.net/vb/faq.php...b3_attachments

I've tried uploading .gif files but the site turns them into .jpgs. Any reason for this? I haven't attempted going the url route.