I'm not seeing the problem when I try uploading a .zip file. Would it be possible to share the project that contains the .zip file you are unable to view? I'd like to take a closer look and try to identify the issue.
I have filed an issue with developement on this. There seems to be one component (33MB) that causes this to time-out when uploaded to Solid Edge Portal. If I upload the file by itself, it will upload and is viewable without any problems. Developement will take a look to see why the assembly is failing.