If you select multiple files and right click on them to select "Combine supported files in Foxit PDF Editor" to combine files, files you added will be listed in the Combine Files preview pane:
You can adjust the order of the files to be displayed in the combined PDF by the files’ name, modified time, size, or bates numbering by clicking the corresponding column name in the files list. Click the column name again to reverse the order. (Note: To order by bates numbering, all files in the dialog box should be PDFs and use the same bates numbering formatting.) For a multipage file you add, click the icon in front of the file name to expand all pages in it, or click the icon to collapse the pages.
Alternatively, you can adjust the order of files and pages manually as desired by clicking Move Up or Move Down command in the Combine Files context tab, or dragging and dropping a file/page to the desired location. In some situations, it is not allowed to move files/pages. For example, you cannot move a page/file into a multipage file you can set the files order by clicking "Name" to sort by Name or click “Move Up” or ”Move Down” to change the order.
