Hi,
I am encountering an error when attempting to publish a polygon feature class to my enterprise portal as a map image layer. I am attempting to publish national zip codes with an additional text attribute field - approximately 33,000 features. When I attempt to publish the layer, I am getting a very generic error message: "Failed to Publish Web Layer". There is no error number or additional information attached. The logs show that the publish is failing at the upload step:

I am running out of troubleshooting ideas at this point. I am using the same sharing settings that I have used in the past, and I can still publish other layers successfully, so I believe I have narrowed the issue down to the zip code layer itself. I even tried exporting just a few of the features to a new, smaller feature class and was able to publish that successfully to Portal. This leads me into thinking that the size of the feature class could be the issue, but I'm not sure..
Does anyone have any suggestions to troubleshoot this further? I am relatively new to Enterprise so I might be missing something obvious..
Thanks in advance for any advice.