Event/Trigger in server code when a new file was created by client

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Is there some way to get an event/trigger (or even by polling) when a new file was created by a client (especially by a specific user)? For instance I want the server to create a file test2.txt and send an email with uploaded file as attachment when user ABC uploaded test_*.txt. I understand the custom actions needs to be implemented but can the FTP server give the event/trigger.