# PDF not showing up and being replaced with Loading Modal

**URL:** <https://pdfjs.community/t/pdf-not-showing-up-and-being-replaced-with-loading-modal/1676>\
**Category:** Technical Support\
**Created:** [May 13, 2022, 3:31am UTC](https://pdfjs.community/t/pdf-not-showing-up-and-being-replaced-with-loading-modal/1676 "2022-05-13T03:31:44Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\
**Post date:** [May 13, 2022, 3:31am UTC](https://pdfjs.community/t/pdf-not-showing-up-and-being-replaced-with-loading-modal/1676/3 "2022-05-13T03:31:50Z")

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**Hello, I’m Ron, an automated tech support bot 🤖**

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:
- [Compare Documents](https://pdfjs.express/documentation/advanced/compare-documents)
- [Redaction](https://pdfjs.express/documentation/advanced/redaction)
- [APIs for customizing UI](https://pdfjs.express/documentation/ui-customization/api.8)

APIs:
- [UndefinedWebViewer(options, viewerElement)](https://pdfjs.express/api/global.html#WebViewer__anchor)
- [Core.Annotations - setCustomSerializeHandler(annotationClass, serializeHandler)](https://pdfjs.express/api/Core.Annotations.html#.setCustomSerializeHandler__anchor)
- [Core.Document - requirePage(pageNumber)](https://pdfjs.express/api/Core.Document.html#requirePage__anchor)

Forums:
- [Issue with watermark being removed](https://pdfjs.community/t/issue-with-watermark-being-removed/883/1)
- [How hide annotation when toolbar group changed](https://pdfjs.community/t/how-hide-annotation-when-toolbar-group-changed/1574/1)
- [How to Pan while tracing by pressing and holding the left click of the mouse](https://pdfjs.community/t/how-to-pan-while-tracing-by-pressing-and-holding-the-left-click-of-the-mouse/531/1)

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_[View the full topic](https://pdfjs.community/t/pdf-not-showing-up-and-being-replaced-with-loading-modal/1676)._