For L2 EAD application do I need to send original L1 approval notice (I797) or copy of it should work?
A copy will do perfectly fine. If you send any original document to USCIS, you can pretty much kiss that document "bye bye"..
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Copies should be sufficient at that juncture.
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Copies are preferable as you do not want the original(s) to get lost.
This advice does not form an attorney-client relationship and is merely informative. It should not by itself be relied upon to address a legal concern.