+|==--defer-downloads==|When submitting a workflow, defer downloading HTTP URLs to workflow launch instead of downloading to Keep before submit.|
+|==--varying-url-params== VARYING_URL_PARAMS|A comma separated list of URL query parameters that should be ignored when storing HTTP URLs in Keep.|
+|==--prefer-cached-downloads==|If a HTTP URL is found in Keep, skip upstream URL freshness check (will not notice if the upstream has changed, but also not error if upstream is unavailable).|
+|==--enable-preemptible==|Use preemptible instances. Control individual steps with arv:UsePreemptible hint.|