# EPUB library (/docs/troubleshooting/epub-library)



## A book is queued, processing, or retrying [#a-book-is-queued-processing-or-retrying]

Refresh after a short interval. Those are active work states, not completed books. Repeated attempts
can indicate a temporary content or delivery dependency. Administrators can review the generation
events and reason codes.

## A book failed [#a-book-failed]

Open the associated reading list or capture result and record the reason code. Determine whether a
particular source was unreadable, no new article was available, or generation itself failed. Avoid
deleting the record before collecting the useful diagnostic details.

## A book is ready but not on the device [#a-book-is-ready-but-not-on-the-device]

The EPUB generation succeeded. Continue with [Device and delivery troubleshooting](/docs/troubleshooting/delivery).

## A chapter is missing [#a-chapter-is-missing]

Confirm the item was new for that list and that its source returned usable content. A failed or
excluded article is not silently replaced by an empty chapter. Feed and article reason codes help
identify the source.

## The download does not start [#the-download-does-not-start]

Confirm the book is ready, then retry from its detail page. Check browser download permissions and
available disk space. If another ready book downloads successfully, report the affected book's ID and
time without sharing private content.

## A book disappeared [#a-book-disappeared]

Check the **Archived** view and clear search filters. Archived books can be restored. A permanently
deleted book cannot be restored from the library.

## Bulk actions affected the wrong set [#bulk-actions-affected-the-wrong-set]

Search, page, and selection state can change the visible rows. Before a bulk archive, restore, or
delete, review every selected row and the total selection count.