I guess it's because you are setting limit as 3 000 000 bytes, but 3 million bytes are not 3 MBs, but 2.86, so 2.9 MB file is over limit.
thanks you for your reply,
but still i am facing the same problem what i mentioned earlier.
Can any one confirm me.
Overall request size.
Thank you for you reply.
Do you have any idea how can we get the request size.
Can you please help me in this.