FAQ

After upgrading to iOS 18 and iPadOS 18, it seems that even if you clear the content cache of books stored in iCloud Drive/Booklover from your library, they may be automatically re-downloaded aggressively, regardless of file size. (Even though the cloud label on the top right of the book turns blue after clearing, it reverts to green after a while.)

This seems to be an issue in iOS 18, and the exact reason or cause is still unclear at this point. However, we have found a potential workaround to prevent this.

1. Open the "Files" app from the home screen of your device.
2. In the sidebar, select "iCloud Drive" under "Locations" and open the "Booklover" folder from the list on the right.
3. Tap "Select" and then "Select All" to choose all files and folders in the folder.
4. From the "More…" menu at the bottom right of the screen, choose "Remove Download."

After following these steps, the unwanted re-downloads no longer seem to occur. (However, the auto-downloading of lightweight files, which has been occurring since iOS 17 or earlier, may still happen.)

We will attempt a fix as soon as we determine if any action can be taken on the developer side regarding this issue.

If the 'Booklover' folder is not automatically created when checked in 'Files' app, please try the following steps.

1. Turn off 'Sync this iPhone' in the device's 'Settings' under iCloud Drive settings. (For iPad, it will be 'Sync this iPad'). Restart the device and turn it back on.
2. Select an appropriate book in Library using the 'Select' option at the top right of the screen.
3. Tap the icon at the bottom right of the screen that looks like 'an arrow coming out of a box' (which means 'Share').
4. Execute 'Move to iCloud Drive'.
5. The book will be moved to iCloud Drive, and the 'Booklover' folder will be created in iCloud Drive simultaneously.
6. From then on, files within the 'Booklover' folder will be synchronized.

(Books moved to iCloud Drive can be selected again in the library and returned by choosing 'Move to Local'.)

Book files in the Booklover folder on iCloud Drive are downloaded and cached on the device when tapped in the library. However, under certain conditions, such as when the device's free storage is running low or when a file hasn't been accessed for an extended period, iOS will automatically clear the cache to free up storage.

This behavior is consistent with other files stored in iCloud Drive and can be confirmed in 'Files' app. (Files in an undownloaded state display an icon with a cloud mark.)

While Booklover has a feature that allows users to manually request iOS to clear the cache of book files ('Clear Content Cache'), the app does not clear the cache on its own.

[Update: December 19, 2024]
On iOS 18, you can now retain cache on your device by selecting a file in the Files app, long-pressing it, and choosing “Keep Downloaded” from the displayed menu.

When manually selecting 'Clear Content Cache' from Booklover, the app requests iOS to clear the cache of that iCloud Drive file. However, it seems that the cache might not be cleared depending on the file's state. Furthermore, for smaller-sized files, even if the cache is cleared, the OS might automatically redownload them immediately.

In general, we recommend users not to be overly concerned with managing the cache of iCloud Drive files and to leave it to the OS.

In most cases, restarting the device will initialize the OS's helper applications, resolving issues related to file imports. Please also make sure that your cloud storage service app is updated to the latest version.

There's no need for users to manually create a folder named 'Booklover'. When you first launch Booklover, a folder with the app's icon and named 'Booklover' is automatically created in iCloud Drive. You can confirm the existence of the 'Booklover' folder with the app's icon in the standard 'Files' app within iCloud Drive.

First, check within the device's 'Files' app under the iCloud Drive's Booklover folder to see if the target book files for syncing exist. If the target files are not present in the 'Files' app, it indicates that the sync between the device and iCloud Drive hasn't taken place, and the target books will not be displayed in Booklover. In such cases, restarting the device may initiate the syncing process. (Note that it might take up to an hour for the sync to start in some cases.)

After confirming that the book files have been synced within the 'Files' app, try launching Booklover.

To import book files stored in a cloud storage service using Booklover, you need to have the dedicated app provided by your cloud storage service installed on your device. (For example, if you have files in Dropbox, please install the Dropbox app from the App Store.) After the corresponding app is installed, tapping the 'Import' button on the left end of the toolbar at the bottom of the library will display the name of that service (app).

E-books sold on platforms like Amazon typically have electronic restrictions (DRM) to protect copyrights, ensuring they can only be viewed on dedicated devices or apps. However, there are many publishers and indie book sales sites that sell e-books without applying DRM to the content. E-books purchased from these sites can be freely viewed on any app or device that supports their format. Of course, files you've created yourself, such as those scanned from physical books using a page scanner, documents saved in PDF format, or collections of your favorite images archived in ZIP or RAR formats, can also be viewed as DRM-free e-books in Booklover.

Currently, Booklover does not recognize 'nested' archive format files (e.g., a ZIP or RAR file within another ZIP or RAR file). If the contents of a ZIP or RAR file are solely another ZIP or RAR file, Booklover will treat the content as empty, resulting in an error when trying to open it as a book.

The current version does not support this.

Booklover does not support classification of books into folders. When you categorize a large number of books into folders, the operations needed to move from one book to another can become complex, making spontaneous book selection more challenging. Therefore, we recommend managing books through metadata (such as by genre, author name sorting, filtering by tag data) similar to how music files are managed on iTunes.

Yes, you can import files saved in external cloud services such as Google Drive or OneDrive or Dropbox into Booklover.

To do so, use the "Import" button located at the left end of the toolbar at the bottom of the library screen. (In the window that appears, select your desired service from "Locations" in the side menu and browse for your file.)

Please ensure the following prerequisites are met before importing:

1. The app for the respective cloud service (e.g., the "Drive" app for Google Drive) is installed on your device.
2. You are logged in to the app.
3. The cloud service is enabled in the "Locations" section of the file app by editing settings.

Manual rearrangement is currently not supported. As the number of books increases, manually sorting the library becomes progressively more challenging. Instead, we recommend sorting by phonetic order of author names, titles, etc.

The current version does not support this.