Direct answer: reply within the deadline in the notice using the specified channel, even if a document is still being issued. Attach an explanation and proof that you requested it; ask for an extension only if allowed. Organise files, state the case number and keep delivery proof. Example: for a pending foreign certificate, attach the consulate receipt and expected date. Sources: Portale Immigrazione and Questura; checked 24/10/2026.
Who this applies to: Anyone receiving a supplement request who must send exactly the requested documents by the written deadline.
Practical steps: 1) read the request and note the deadline for each document; 2) prepare certified copies, translations or legalisation only when the list requires them; 3) send the supplement through the same portal or channel, naming each attachment with the case number; 4) save the protocol and receipt and monitor the status until the office confirms receipt.
Documents to keep: supplement letter, attachment list, sending proof, ID and full file copy.
Verifiable timing and costs: The notice sets the deadline; a late submission may not cure the omission.
Exceptions and special cases: Do not add irrelevant data or originals; document any impossibility.
If the procedure stalls: If the channel fails, keep proof and use the listed contact; request an extension only if allowed.
Practical example: The applicant receives a payslip request, sends it within the deadline with an index and keeps proof.