Just a guess, but are you using Attach files /Manage attachments in the Additional Options pane? This will open a pop-up window asking you to Browse, ie locate the image, on your computer. You then upload and close the pop-up window. When you Preview, it will show up as a thumbnail in the lower LH corner.
If you want to embed it in the message window, click on the thumbnail, copy the image link, then go back to the message window, click on the little photo icon ("insert image") remove the "http://" header, then paste the image link you copied. (If you're linking to an online image, you don't have to remove the "http://" header.)
Depending on your Forum status, there are limits on the size (physical dimensions and data) of the image you can post.
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