This is a great location to get assistance! I read your post and see that you want to know how to change the paper size on HP Envy 5640 printer from your android phone. I would like to help you resolve this issue.
You can use HP ePrint App to change the paper size from your phone.
Click here and refer the document to know how to install and use HP ePrint app.
Let me know if that helps.
Sandytechy20 I am an HP Employee
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