To use this option you must have GostScript and ImageMagic extension on your PHP web server
This behavior can be used to show a multipage PDF thumbnails visualizer.
To be compatible with this behavior the PDF thumb must be created with our resize extension.
This behavior create a thumb visualizer where the user can see the pdf page thumb and with a next and a previous button can navigate between the PDF pages thumb.
The extension create a multi-page image visualizer like this:
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And you can setup the icone will be used for the next and previous button and the text between the 2 buttons.
The next and previous button are used to navigate between the pdf page thumbnails.
To verify if on your server you have the required extension you can use this page: Check ImageMagic and GhostScript InstalledTo see how install the GhostScript and ImageMagik extension see this page: Install ImageMagic and GhostScript 