RWP (2.3.3+) can determine if the 'Download Archive' menu item should be
showed based on the value of downloadUrl.
If set to 'null', will hide the menu item:
- set downloadUrl to public collection download for public collections
replay
- set downloadUrl to null for private collection and crawl replay to
hide the download menu item in RWP (otherwise have to add the
auth_header query with bearer token and should assess security before
doing that..)
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Co-authored-by: Tessa Walsh <tessa@bitarchivist.net>