Thumbnail previews of documents and templates provide easy identification of those files in Adobe Bridge and in Version Cue file dialog boxes. A preview is created when you save a document or template. A document preview includes a JPEG image of only the first spread; a template preview includes a JPEG image of each page in the template. You can control the size of the preview to suit your needs. For example, Extra Large 1024x1024 enables you to quickly scan the contents of a page at high-resolution before you open the file.
You can enable the option in Preferences or in the Save As dialog box. Because previews increase both file size and the time it takes to save the document, you may prefer to enable the option on demand using the Save As dialog box.