FWIW... I've found that happens if I've uploaded an image in the attachments window; then, closed the composition window for some reason and opened it again. The new composition window doesn't link to the existing attachments window. The original attachment number, which may have been copied along with other information from the original composition window, won't work if pasted in the reopened window. A new attachments window has to be opened for the newly opened composition window and the image uploaded again which generates a new attachment number to put in the post.
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