Supported Audio File Types (DRM-free only): .mp3, .m4a, .m4b, .aac Download - Dropbox, Google Drive, Microsoft OneDrive. - Apple Files. - Web Uploader for importing from your computer via WiFi. Manage - Move audio files between books. - Change cover art. - Sort based on author, title, recently added, and recently played. - Rename title and author. - Choose between a number of fun themes. - Dark mode support. Play - Automatically saves playback location as you progress through the book. - Independently configure seek forward and seek backward times. - Chapter support for audio files with embedded chapters (.m4a / .m4b / OverDrive .mp3). - Change playback speed from 0.5X to 3.0X. - Smart Rewind when returning to your book after a while. - Sleep Timer with configurable time or at the end of a chapter. - Manually bookmark locations that you want to return to. - CarPlay support. If you enjoy using Bound, please consider writing a review.