Updated: 17 June 2021.
Upon upload, if no selection is made to either insert as full or insert as thumbnail, the uploaded image will insert as FULL by default. This is new behaviour, on previous version of the forums, the thumbnail would default.
More re: forum upgrade (June 2021 upgrade).
The image upload process has not actually changed, but the new system generates a thumbnail that looks like the image is already embedded in your post, but it is...
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