### Answer Based on reported issues, knowledge base syncing problems can occur due to temporary platform issues [(1) ]() . When users experienced similar sitemap loading failures (showing blank lists or 0 pages) , the issue was often resolved by waiting and trying again later . If you're seeing 0 pages detected for a website that should have content, try these steps: 1. Wait and retry - Browser or temporary server issues can cause this 2. Clear your browser cache and refresh [(2) ]() 3. Try a different browser 4. Verify the URL is accessible - Test with a simple known website first [(1) ]() When adding URLs to a knowledge base, the system should display available pages to select from the sitemap . If you continue seeing 0 pages after trying these steps, this could indicate a backend issue similar to previously reported 500 errors with knowledge base endpoints [(3) ]() . For persistent issues, you can reach out through the [Documentation]() or visit the [Hire certified Retell partner]() page. Would you like a general answer based on my knowledge instead?

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

​ To learn more, see the sources I considered: [[1] Sitemaps not loading. Receiving 500 error](https://discord.com/channels/1186424376300679209/1346890973346660529) [[2] Knowledgebase not working](https://community.retellai.com/t/knowledgebase-not-working/750) [[3] Major Issue with KB](https://community.retellai.com/t/major-issue-with-kb/228) ​

@AI Evy the issue persits, and the url is accessable 100%

### Answer Since the issue persists despite the URL being accessible, this appears to be a backend processing problem [(1) ]() . Based on similar reported cases, here are additional troubleshooting steps: For URL-based sources: - If you're trying to add a URL that points to a PDF file download link, upload the PDF directly as a file instead of a URL, since URLs can only read HTML webpages - Knowledge bases support at max 500 URLs per knowledge base [(2) ]() - Supported file formats include .pdf, .html, .md, .txt, and many others, with each file limited to 50MB and a maximum of 25 files If you've enabled auto-refresh: - Auto-refreshing re-fetches all URLs in the knowledge base every 24 hours - Auto-crawling can be enabled for specific URL paths to automatically crawl pages every 24 hours - There have been reported issues where auto-syncing stopped working, requiring support team intervention to fix [(3) ]() Next steps: Since you've confirmed the URL is accessible and the issue persists, this likely requires direct support investigation. Similar cases where knowledge bases showed "Failed to process the knowledge base" or 0 pages required backend fixes [(3) ]() [(1) ]() . Contact support with: - Your organization ID - The specific URL you're trying to add - Screenshots of the error/0 pages display Visit [Documentation]() or [Hire certified Retell partner]() for assistance.

​ To learn more, see the sources I considered: [[1] Knowledge Base - Failed to process the knowledge base](https://discord.com/channels/1186424376300679209/1432477729231601795) [[2] Knowledge Base](https://docs.retellai.com/build/knowledge-base) [[3] Knowlegebase not Synching](https://discord.com/channels/1186424376300679209/1473736259066400988) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

### Answer To contact support for your knowledge base issue, you have these options: Visit [Documentation]() or [Hire certified Retell partner]() for assistance. Based on similar knowledge base syncing issues, users have successfully resolved problems by sharing their organization ID with the support team [(1) ]() . In your case, provide: - Your organization ID - The specific URL showing 0 pages - Screenshots of the issue The support team has previously fixed backend knowledge base syncing issues after receiving this information .

​ To learn more, see the sources I considered: [[1] Unable to sync knowledge base](https://discord.com/channels/1186424376300679209/1474024221867900948) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.