Here's what I do...

by Hoot , Diversityville, Liberal-sota, Thursday, January 20, 2022, 20:45 (974 days ago) @ Byron

I post only from my laptop or desktop. I have no idea how a phone might work.

Just to the right of this box where I'm typing is a series of buttons. The eighth one down is "upload" which opens a dialog box. One of the options is, "Browse" and you would then navigate to the folder in which your picture is located, Select the picture and (I think) "Open" to upload it to the posting box where this is all being typed.

Pretty sure that's all. Holler if you have issues and I'll try to help.