> ## Knowledge Base Index > Fetch the complete knowledge base index at: https://helpdesk.tiiny.host/sitemap.xml > Use this file to discover available pages before exploring further. > Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash). # Why is my project showing as a preview? Preview links are temporary and come down after one hour. It happens for one of five reasons, and upgrading fixes all of them. ### 1. You've reached your plan's project limit This is the most common cause on the Free plan. Free and Tiny both allow **one active project**, so delete old projects before uploading a new one. ### 2. Your project is over your plan's size limit Free accounts allow 3 MB per project, and 0.5 MB for PDFs. See [Plan limits explained: projects, uploads, visits and bandwidth](https://helpdesk.tiiny.host/en/article/plan-limits-explained-projects-uploads-visits-and-bandwidth-1ihflbr/) for every plan. ### 3. You're uploading a PHP file PHP requires a paid plan. See [Do you support PHP?](https://helpdesk.tiiny.host/en/article/do-you-support-php-1cp432u/). ### 4. Your content can't be hosted on the free plan Some content types are restricted on the free plan. See [We're unable to host this type of content on our free plan](https://helpdesk.tiiny.host/en/article/were-unable-to-host-this-type-of-content-on-our-free-plan-1l9v94w/). ### 5. Your project has a password field or a redirect script Projects containing a password input field, or a script that redirects visitors to another page, are held in preview for manual review. If that doesn't match what you actually uploaded, delete the project and re-upload it, as most false positives clear on a second pass. Still stuck? Email support@tiiny.host. ### Making it permanent Upgrading to a paid plan publishes your project permanently and raises your limits. See [our plans](https://tiiny.host/pricing). Until then, treat the preview link as a way to check how your content looks, not as hosting.