How to upload 10k+ xml links to KB ?

Hi, we are trying to find a way to add thousands of xml links to our chatbot's KB, but we can't seem to find a way that works properly. We tried adding a PDF with 11,000 xml links (basically links that contain property listings) but seems that the bot doesn't know what's inside those links. Does anyone here know how to make it work? Our goal is to have a chatbot that can recommend listings from a large KB based on the clients input. We are currently one the free voiceflow plan since we are just making the demo bot. Could this be the reason why the PDF approach doesn't work or maybe you know if in our case we'd need an external/3rd party solution ? Is it even possible to make this ?