The Kindle Fire tablet can store thousands of documents in a variety of file types. You might access some of these documents through the Books list on your Kindle. There, you can organize your documents by Cloud Collections. If some of the documents on your Kindle are not accessible through your Books library, you can use a third-party file management utility to organize them.
Tap the "Books" content library on your Kindle Fire home screen. The content libraries are listed at the top of your home screen.
Swipe across the left edge of the screen and tap "Collections." This will open the Collections page.
Tap the plus sign to begin creating a collection. Enter the desired name for your new collection and tap "Create."
Select the books you wish to add to the new collection and tap "Add."
File Management Apps
Download a file management app from Amazon.com. ES File Explorer, File Manager and File Manager Free are three free file manager apps compatible with many Kindle Fire models.
Tap "Apps" in the navigation bar of your Kindle Fire home screen. This will list the apps in your Apps library.
Open your file manager app.
Create a folder in the desired location on your Kindle Fire. The exact method by which you create a folder will vary depending on the file manager app you use. Most apps have a button for creating folders in the options menu.
Move the desired documents into your new folder. Some apps allow you to move a document once you tap and hold on it. If yours does not, you can cut and paste the document into the new folder.
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