i have added a build to an existing app as update. The build was uploaded successfully and i selected it and saved. When I moved to next screen for submission there was some options related to encryption. Then I made some selections, but was not sure about it. So I just logged out the account without selecting next/save. But currently the app is in Prepare for Submission state , but the meta data seems non editable. Also the Save & Submit for Review options seems missing !!!!!!!
I found answer by myself. My user account credential had been changed by admin unknowingly. So I lost credential to submit app. When my admin gave me back those credentials to my account the submit and save buttons became visible and I did submit.