Make sure you're logged in to your Adobe ID in the CC desktop app (in the menu bar on Mac, task bar in Windows). Click the "gear" icon > Preferences > General > Sign Out, then sign in again.
Also, see you it's just this particular publication. Try a simple page or two first to see if that's working.
What size and format are you using for the videos?
I am having the same issue and have been trying all day. My deadline is tomorrow morning. I tried even going back to 2017 version and still get the error! HELP~ BTW no videos in mine!
Hi, Im new to using Forum's. Everytime I try to Publish my simple one page Epub i get this message for two days now.
i had a Four page Epub that i went through incredible difficulty but finally Published. I tried every suggestion you gave; Logging in and out of Indesign Help and Cloud Service. Changed Proxy settings. Disabled Anti Virus. I even Deleted my old preferences and Reinstalled Indesign. Nothing worked. Then mysteriously one night after about 20 tries in a row; it worked!
Now i am going through the same thing all over again with a simple one page Epub. I keep getting this error:
An error occurred while uploading your document. Please try again.
I followed the LLink suggested and it gave this text response: