I’m having a similar issue, except that I’m unable to publish a particular place file, rather than not being able to publish at all.
I can publish any other file, to any other place, except this one. If it matters, the file size is approximately 26.5 MB, and I am the only one on my development team that cannot publish it; everyone else can.
For testing, I removed a portion of the game to see if then I could publish it. When I did, it decreased the file size to 20.1 MB, and I was able to successfully publish the file. Although, this was not an ideal solution because the stuff I removed was necessary to the game itself.
I posted about my related issue here: