FileButton

Which file types the dialog offers, in the `accept` syntax. It is a filter on the dialog and not a guarantee — a determined user can still hand you anything, so validate what arrives.

Asks a mobile device to capture from a camera instead of browsing. Ignored on desktop, so it cannot be relied on as the only route to a file.

A render function, not nodes: it is handed the opener and has to wire it to whatever it renders. The real `input` stays hidden, which is what lets the trigger be any control you like while the picker keeps working.

Blocks the picker from opening.

Whether more than one file can be picked. It also changes the shape of what `onChange` gets: an array here, a single file without it.

Name of the underlying input, for a plain form submission.

Receives the picked files: one `File` on its own, or an array with `multiple`. It also fires with `null` — or an empty array — when the dialog is dismissed, so guard before reading.

NOT IMPLEMENTED. The component never calls this, so no reset function is ever handed back. The input does clear its own value after every pick, which is what makes re-picking the same file fire `onChange` again.