if you mailed your application on May 6 that means 7th or 8th it was received to Ottawa. hopefully you can see your ecas next week Tuesday. mean time you can call IRCC and ask them they received or not with your receipt # and get Temp file #.
For Quebec applicant Only:
any one receive confirmation from IRCC that your sponsorship application has been approved before submitting your undertaking application and CSQ to the Ministère.
You have to submit individually 1 for parents and other for GP.
Contact CIC support for sending 2 different application in same package. Thay can help you for next step.