Maybe there is - I changed the name of the folder and now I can validate that the zip file is accessible and contains a Panorama database file. BUT, the Upload button is greyed out.
I get the same problem after validating a single database. I don’t know whether the problem lies with Amazon S3 or Panorama X but it looks more like the latter than not.
Returning to my original question, can anybody recommend another web server?
And, has anybody yet succeeded in uploading to the Exchange?