Tumblr doesn’t provide any way to change the type of a post in its user interface — from a link to a regular text entry, say. This might lead you to assume that your only solution is to delete the original and make a new post, breaking links and losing notes in the process. As you might have guessed from the fact that I’m making this post, however, you would be wrong. You just have to be comfortable with twiddling with some hidden form fields.
Don’t worry. It’s not that complicated.
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