yourforumurl.tld/community/data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAeAAAAFsCAIAAACbxP1hAAAgAElEQVR4nOy9d3Rb55X2q3zjjJuKSbEXsVNULy6yI8ex49gZ23HiEvcSx7ItWbJkSbZkWdVW772Qoth7A3tvIEBUogMECIAgARAg0ctBP23fPyAqnoy/WeuuOzPK5OpZ7+IiKULAOgB+2Od5n73PnMphbcmg8iqFdaq0a/vx/Dc37Xv1kx0vvrf5nc37Pt11/K1N3736ybYv[...and so forth....]
In addition to the above, I was not able to edit the post in question. The editor simply returned a blank text box with nothing in it. Only directly accessing the post record via a database utility allowed me to actually see what had happened when the user complained that image attachments were broken.
Perhaps we could get a check for objects like these at the time of post submission? Or even something that would tell the user right when they drag an image into a post that they should use the image upload feature instead.