Disclaimer: I don't use the forums on mobile, all of this is for desktops.
FAQ on functionality:
Q: How do I embed images in my posts?
A: The forums don't host images, so you have to use a photo-hosting site, like imgur.com. A direct link (i.e. xxxx.jpg, xxxx.png) to most images will auto-embed, or you can hit "Insert other media" then "Insert image from URL."
Q: How do I embed imgur albums in my posts?
A: You no longer can. Albums have always been kind of weird, so you'll