In addition to the above (please check you can actually put items in the list!), you can modify your current submit button code
Currently you said you have:
SubmitForm(EditForm1);If(IsEmpty(Errors(EditForm1)),Notify("Record Has Been Updated Successfully")
However, you can move the notify to the OnSuccess property of the Form itself as I said before, so your submit button becomes:
SubmitForm(EditForm1);
and your form's OnSuccess becomes:
Notify("Record Has Been Updated Successfully", NotificationType.Success)
however, this won't solve the issue you are currently facing, please follow the troubleshooting steps above so that we can look into the separate issue of you not being able to submit.