1. While viewing a document, find View Mode in the App Bar.
2. Select Thumbnails
3. Click on the large blue + button in the bottom right corner, then select Add PDF to merge an entire PDF document, select Add Image to add an image as a new page, or select Add Page to add a blank page to the document.
Tip: The added content will appear behind the currently selected page. So if you want to insert an image after page 8, select page 8 first, and then add the image.
Enable Selection by clicking on the Select button, and then tap on the page you want to insert content after.
Merging PDFs, Images, and adding blank pages to existing PDFs
Reordering pages within a document