> For the complete documentation index, see [llms.txt](https://ayakaleaf-pro.ayaka.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ayakaleaf-pro.ayaka.space/latex/zh-cn/zhi-shi-ku/163-why-does-it-sometimes-take-a-lot-of-time-to-show-the-pdf-preview.md).

# 为什么显示 PDF 预览有时需要很长时间？

这可能是由于你正在编辑的文档中存在错误——只有当文档能够成功编译时，预览才会更新。任何错误都会阻止预览更新，因此它将一直显示上一次成功编译的结果，直到错误被修正。

你可以通过将鼠标移到预览右上角的“error”一词上，查看文档中的任何错误。例如，一个常见错误是需要在数学符号外加上美元符号，例如： $$\phi$$ 而不是仅仅使用 \phi。

如果即使错误已解决，PDF 预览仍未更新，请 [告知我们](https://www.overleaf.com/contact) 我们会为你查看。


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://ayakaleaf-pro.ayaka.space/latex/zh-cn/zhi-shi-ku/163-why-does-it-sometimes-take-a-lot-of-time-to-show-the-pdf-preview.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.