UPDATE - request for additional docs came late today - Request for bank balance . Had submitted it previously so have resubmitted and highlighted the balance which exceeds the 500,000.
I thought that once I submitted the Application  I would be less stressed. I was wrong....waiting for them to process the application is just as stressful :-)   Submitted and paid Sunday.  No progress yet ...yes I know it is only Tuesday but other applications seem to  be getting an additional document request within 24 hours ( applied Hanoi)
TLDR : Answer Summary
An expat shares their experience with the visa application process in Hanoi, specifically mentioning a request for additional documentation regarding bank balance after submitting their application. They express the stress of waiting for processing despite having submitted all required documents. The comments highlight varying processing times, some applicants receiving additional requests within 24 hours, while others have been pending longer. Tips are shared on managing the waiting period, such as checking junk email for document requests and having extra documents prepared.