How can I extract document pages or split documents in Appian?

Enable enableExtractPagesToAppian by setting it to true. First, you need to select pages you would like to extract. To do this, open the Left Panel with thumbnail previews of the current document. You can select one or multiple pages by clicking on a thumbnail (hold shift to select a page range) or pass a text string of the page range at the bottom of the thumbnail panel. Then click on the Extract Selected Pages button on the top right of the WebViewer UI. This will open a modal that will let you name your file. You can click Save to create a new document with extracted pages without changing the original document you are currently viewing. Alternatively, click on Save & Remove pages to remove the pages from the original document and save them into the newly created one.