When I add a new bookmark, it seems like Raindrop.io tries to generate a thumbnail but for all of my wiki pages it can't because it can't authenticate to see the pages. Other bookmark systems had a mechanism to essentially take a screen shot of the page when the thumbnail was created and optionally use that as a thumbnail...thus avoiding this problem. For us, the thumbnails are effectively useless because they all just show an "Authentication screen". This feature would add a lot of value to us