Download a preview file (any extension) attached to the shared playlist as an attachment. Mirrors the authenticated /pictures/originals/preview-files/<id>/download route but gated by the playlist share token instead of JWT.
GET
/shared/playlists/{token}/preview-files/{preview_file_id}/download
curl \
--request GET 'http://api.example.com/shared/playlists/{token}/preview-files/{preview_file_id}/download' \
--header "Authorization: $API_KEY"