Error Domain=com.google.GDataServiceDomain Code=503 UserInfo=0x5cae90 "Operation could not be completed. (com.google.GDataServiceDomain error 503.)"
This prevents the app from jumping to the browser to show the spreadsheet, should you have that option on, but the spreadsheet upload was actually successful despite the message. This problem has been found on other apps that work with google spreadsheets, so the problem is not even iPhone specific. Google is aware of the problem and is likely to have everythng fixed shortly. If we need to make changes to the app, we will do that quickly.
