JPEG should work, but you can’t post directly from your computer. You must use a host site. Then just copy the address of the image and paste directly in the text box. Don’t use the image icon in the text box menu bar.
If you are copying from another website, some sites won’t allow you to copy directly from their site.
“As we act, let us not become the evil that we deplore.” Barbara Lee
“Politicians and pro athletes: The only people who still get paid when they lose.” William Rivers Pitt