The Photo Album with Flickr RSS

If you're encountering issues when trying to use a Flickr RSS feed with RapidWeaver 3.6 / 4.x's built-in Photo Slideshow you should make sure that the URL contains, or ends with:

&format=rss_200

This tells Flickr to serve up a suitable type of XML feed that the slideshow can understand. If your feed URL does not currently have this somewhere in the URL, simply add it to the end of the feed - don’t attempt to insert the code anywhere else - and the slideshow should now display images from the relevant Flickr source.