Contact Form 7 – change uploaded file name before storing

Hi, I am using Contact Form 7 plugin for a form for getting data from users with file upload field. I am using Advanced CF 7 DB plugin to store the entries into the database.

Now i just want to rename the file attachment before saving it on the server directory. For example (filename.pdf -> username_date_filename.pdf) where date is the date of submitting form and username one of the text field of the form completed by the user before submission.

I saw a topic about it but was not detailed enough for me to reproduce it.

Many thanks

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