Find a filename in database

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Hi,
How can I retrieve the file name of a document? for exemple, in the screenshot, I have a doc named Certificate.pdf, and the filename is Heart2-2155666522.pdf.
in the database, I find the name "Certificate.pdf", the doc_id, the file_id, but not the name of the file.
I need it to be sure than the uploaded file is a pdf...

[saled]

table attachment !!