New to this. How do i post pics in PM?

I'm Trying to post a design sketch in a PM to send to another member but cant figure out how to do it. I'd appreciate any help anyone can offer. Thanks!

There is a square icon that is a image of a tree in a picture frame. Third from the right between a video reel and the earth with an infinity like symbol. Just press that icon and it will give you the option to insert the photo link and post it in the msg. Just put the image on a image hosting site. I hope this helps.

Thanks!