Presigned PUT URL for this part.
Part payload slice.
Content-Type header for the part PUT.
Called with loaded bytes for the in-flight part.
Returns true when the overall upload was cancelled.
OptionalsetTracks the active XHR so callers can abort an in-flight part.
OptionalxhrFactory for XHR instances (defaults to () => new XMLHttpRequest()).
OptionalsleepBackoff sleep implementation (defaults to sleep).
Options for uploadPartWithRetry.