A provider lookup answers whether a unit is covered. It does not produce the
invoice or the extended-warranty certificate, and a manually entered warranty
had nowhere to keep one - so the proof stayed in somebody's mailbox until they
left.
Two columns rather than one: the served URL of the stored document, and the
name the vendor sent it under, because "Dell invoice 4471.pdf" is what a person
recognises a year later and "warranty-12.pdf" is not. The download route sends
the original name back.
Authenticated in both directions, unlike an asset photo: an invoice carries
pricing and a service tag. One document per warranty, replacing any prior
extension so a re-upload as .pdf does not leave the old .png behind claiming to
be current. Capped at 25MB - a certificate is a document, not a disk image.
Office formats are allowed because purchase records genuinely arrive as .msg
and .xlsx, not only as PDFs.
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