Start by building an EPUB 3 file of your content by clicking Create New Build button. Builds may require 2-30 minutes to complete depending on the complexity of content and number of concurrent builds by other Studio users in the cue.
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While your EPUB is building, you will see a progress bar indicating progress. You can leave this page during the build process, and your EPUB will continue building in the background.

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Once your build is complete, you may see some information warnings about your content.

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An accessibility checker has been integrated into the EPUB builder process. When a new EPUB build is generated in Studio, a downloadable accessibility report will be produced, listing any accessibility issues identified in the EPUB.
The report includes the following details for each issue:

  • Issue Type
  • Description
  • Severity
  • Resource Path
  • WCAG Rule

In addition, Studio users will have access to a deep link that navigates directly to the specific block and screen where each issue can be found, making it easier to locate and address items efficiently.

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Warning messages may inform you of the following issues:

  • Your product does not have final publication-ready metadata. (You can still build and preview without final metadata. Studio will use default metadata until the publication-ready metadata is entered.)
  • A link to the media was found to contain unsupported characters, so Studio has replaced those characters in order to proceed with the EPUB build.
  • A link to the media file is broken on the specified screen. Please check the link.
  • A link on Screen A to Screen B of your product is not finding the target screen. Please check the link.
  • The x-numbered block on the specified screen contains invalid XML. Please check the block.

Accessibility warning message may inform you of the following issues:

  • An image in a block on a content screen is missing alternative text in your EPUB file
  • A video in a block on a content screen is missing a caption file in your EPUB file.
  • A video in a block on a content screen is missing a transcript text in your EPUB file.
  • An audio in a block on a content screen is missing a transcript text in your EPUB file.

A successful build is the first step required for previewing or publishing in Bookshelf.

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If an issue is encountered that causes your build to fail, Studio administrators are immediately notified. Once the issue is resolved, you will be contacted.

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