Images from the Web have disappeared

Hello, for the start page in my campaign I used a chain image by dunjinni.com which I found using R20's Art Library Search function. Over night, all of these images have disappeared from my start page. This has happened before and I had to redo the entire start page since every chain image was lost. 

Roll20 does not copy them over, it just places a pointer to the other website. Images on other websites may disappear at any time and the pointer points to nothing. If they are critical you should download them to your PC, then upload into your Roll20 Art Library, then drag them from your Art Library onto the VTT.

That would be the case except that these images could still be found in the Art Library

The Art Library contains cached images from the last Google Image search 5 or so years ago before Google changed their API to disallow such activity. It's possible the cached images remain there but are unavailable elsewhere. I would recommend not trusting the in-app web search and just performing a regular Google Image search to find web resources. The in-app version was left up as a courtesy for when it does work, but there's no way for Roll20 to maintain or support it.