Usually there is a display in the lower left of the page telling the progress of the upload. The system will not let you move to the next picture until the previous is done. I would expect this error if you tried to save a draft while the last picture was still up loading. If that isn't the case you may have experienced a glitch in the working of the forum. If this happened to me I would probably go back and delete the last picture and reload it, making sure it was done and then try to save the posting again.
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Yeah, I did not see anything indicating there was an image still loading.
I ended up taking the risk and closed the browser window and then reopened the Draft for editing. This gave a recovery option which seems to have brought back the edits I had made recently. I'll have to see if anything is missing.
I've raised this with the development team to investigate.