Based on the “jelly” you sent, it seems that you might be in the UK, which might be causing the confusion - in the US, our “jelly” is like jam or preserves, whereas the product you posted would be called “Jello” or “gelatin” :)
Grape jelly

vs grape jello






Absolutely, 100% recommend using this site. I’ve been using it for background noise for at least ten years now. Has everything you’d expect (rain, surf, flames crackling, white/brown noise) and then some (cats purring, airport, laundromat), all without having to listen to a “break” between tracks. You can even change the volume of individual parts of the track.