It took me like a year to figure out how to post pictures here. Keep trying!
While you can embed an image into the text with some sort of copy command, that hasn't worked for me. Nor does the paper clip icon, I have to chose Go Advanced below the text box. For me, the big thing is file size, my old school digital camera does not have many options and I have to reduce the file size. Although there are now pricing plans, I've always used this site for free:
https://www.reduceimages.com/
When you do get to the Attach pictures part, you have to stretch out the window to the far right until you find the Upload button. With my various protections, I have to CTRL click to select the manage attachments in that set of options.
We have a help file here:
Including Images and Attachments (as of 24 Jan 2020)
And I really like Ourworkbench's list of help, here's one copy:
Star of David Singer
To further complicate things, you have like a 5 minute time limit to edit your posts! And I often time out/get logged off so I've learned to copy my text before I hit the reply button!!