After you file

I, too, was very frustrated by this. I finally got it to work and replicated it several times, so I am confident it will work for you.

I went to TurboTax online as if I was going to file my taxes. I then clicked on Help. Typed 1099. This will give you ai generated responses.  and a box that you can click on that says 1099 misc or 1099 nec. Click on it. You will now notice that the menu on the left side of the page changes. You will see the Document option on the upper left side. I clicked it and my documents were there. The three little dots that opens up the options to delete was there. I was elated. I was able to delete the files. 

I hope this helps someone.