[OPEN] Large courses fail to generate ePub

Issue Documented: 2025-11-17
Canvas

Engineers are currently investigating the issue.

Description

Generating ePub for courses with large amount of content or large files fails at 90% completion.

Expected Behavior

ePub should generate successfully for courses that are active and within their file storage quota.

Workaround

No workaround exists at this time.

Steps to Reproduce

Prerequisite - Have an active course with “ePub Exporting” feature option enabled and a teacher enrollment.

  1. Add a large file to the course. (I used a 432 MB MP4 file)

  2. Add the file to modules page.

  3. As the teacher navigate to Account → Settings → Download Course Content

  4. Inspect the page and generate ePub file.

  5. After a few minutes note that the ePub fails to generate

Additional Info

FOO-5914

Known issues indicate notable behaviors that have been escalated to the Canvas engineering team. Known issues are not a guarantee for an immediate resolution. This document is for informational purposes only and does not replace the Support process. If you are encountering the behavior outlined in this document, please ensure you have submitted a Support case (per your institution's escalation process) so Canvas Support can adequately gauge the overall customer impact and prioritize appropriately.

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