# Viewer displays PDF correctly / Merged PDF file missing form fields

**URL:** <https://pdfjs.community/t/viewer-displays-pdf-correctly-merged-pdf-file-missing-form-fields/1912>\
**Category:** Technical Support\
**Created:** [July 28, 2022, 9:10pm UTC](https://pdfjs.community/t/viewer-displays-pdf-correctly-merged-pdf-file-missing-form-fields/1912 "2022-07-28T21:10:56Z")\
**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:** [July 28, 2022, 9:11pm UTC](https://pdfjs.community/t/viewer-displays-pdf-correctly-merged-pdf-file-missing-form-fields/1912/3 "2022-07-28T21:11:02Z")

</div>

**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:
- [PDF.js Express Documentation - Annotation](https://pdfjs.express/documentation#annotation-<span-class='plus'></span>)
- [Saving a document with annotations](https://pdfjs.express/documentation/basic-operations/save-document/save-with-annotations)
- [Saving a document as a blob](https://pdfjs.express/documentation/basic-operations/save-document/blob)

APIs:
- [Core.Annotations.RotationUtils - RectangularCustomAnnotationRotationMixin()](https://pdfjs.express/api/Core.Annotations.RotationUtils.html#RectangularCustomAnnotationRotationMixin__anchor)
- [UndefinedbeforeDocumentLoaded](https://pdfjs.express/api/namespaces.list.html#event:beforeDocumentLoaded__anchor)
- [Adding a download button](https://pdfjs.express/api/utils/tutorial-Adding%20a%20download%20button.html#__anchor)

Forums:
- [Save annotation, checkbox in a form](https://pdfjs.community/t/save-annotation-checkbox-in-a-form/685/1)
- [Confirm output of trial form field merger](https://pdfjs.community/t/confirm-output-of-trial-form-field-merger/744/1)
- [Merge API doesn’t save PDF checkboxes](https://pdfjs.community/t/merge-api-doesnt-save-pdf-checkboxes/843/1)

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_[View the full topic](https://pdfjs.community/t/viewer-displays-pdf-correctly-merged-pdf-file-missing-form-fields/1912)._