Thank you for reaching out, and sorry to hear you are unable to publish the document in InDesign. Could you please confirm if this is happening with a specific file or all files? Please try the solution suggested in this article: Upload error while publishing InDesign document, and let us know if that helps.
The error says to check your internet connection. Maybe get closer to the hub? Run a test to see what speed your internet is running www.speed test.net
Thank you for sharing the info and trying with a different internet connection. If you're still experiencing the issue, please connect with us directly using our contact us page so that we can help you on a 1:1 basis.