Indesign will not publish online
I know this issue has been encountered before, but none of the recommended fixes I could find online actually work for me. I get the below message (sometimes, I get the progress bar, but it freezes and remains at 0%)

I have tried everything suggested here: Upload error while publishing InDesign document
and nothing works. I have also restarted indesign and cleared preferences numerous times, and restarted my computer several times, to no avail.
I am positive that none of the interactive elements in my document are suitable for Interactive PDF only. I am trying to export only the first four pages of a 19 page document.
Problem seems to have come out of nowhere! It was working fine just a few hours previously.
Thanks