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Did you add the SimpleTOC block to each post?
No, I did not. I was hoping that this was an automated process. I just went to edit that post and see if I could figure that out and this company uses the old classic editor on posts, and I did not see that option. Is there a short code I can use?
No. The old editor is dead. SimpleTOC only supports the current Gutenberg editor. That is made clear in the Readme. Sorry