Short answer
Private file delivery is a focused way to send a file to specific recipients without turning the transfer into a permanent shared-folder relationship. The sender protects the file, grants access to the intended recipient, sets an access window, and keeps the delivery separate from broad cloud storage or ordinary email attachments.
How it differs from cloud storage
Cloud storage is designed for ongoing collaboration. Private file delivery is designed for a handoff: one sender, one package, a defined recipient, and a narrower period of access. That makes it a better fit for client documents, contracts, tax files, HR packets, incident evidence, and other sensitive files that do not need to live in a shared workspace forever.
What to look for
A private file delivery tool should explain where encryption happens, who can open the file, how long access lasts, whether access can be revoked, which audit events exist, and what metadata remains. If it only says files are secure without explaining who can read contents and how access is granted, the claim is not specific enough.