You can add media to your book two ways: while editing a chapter, or directly into the Media Library.
While in the editor, you will see an "Add Media" button above the main editing area. Selecting this button will launch a pop-up media window. Here you can access the materials in your Media Library, or upload new files.
When you insert media, it will appear where your cursor was in the editor when you selected "Add Media."
In the left-hand toolbar there is a "Media" option. Under this option is "Library" and "Add New."
"Add New" will take you directly to a page to upload files. This is the best option if you are uploading multiple files at once.
"Library" will show you all the media currently uploaded for your project. At the top of the page there is an "Add New" button. You can also see additional information about your files, such as when they were uploaded and by whom, and search the library. You can hover over a file to see options for editing, deleting, or replacing the file.
While in the media library, you will see an option to edit the file when you hover over the file name. This will take you to the editing page where you can change details about the file:
If it is an image file, you will also see an "Edit Image" button under the image itself. This will allow you to make small changes such as changing the scale, cropping, rotating, or flipping the image.
You can edit an image or file within the editor. Simply select the image, and you should see a toolbar appear above it with alignment options and a pencil icon. The pencil icon will launch a pop up version of the file details.