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With unknown metadata, it looks like this: ```xml Custom property Refine 1 Refine 2 ``` ```json { "metadata": { "http://my.url/#customProperty": { "@value": "Custom property", "http://my.url/#refine1": "Refine 1", "http://my.url/#refine2": "Refine 2"...

If that's of any help, I modified Bella the dragon a while back to get unusual dimensions for testing purposes: [bella-landscape.epub.zip](https://github.com/user-attachments/files/17547803/bella-landscape.epub.zip) [bella-tall.epub.zip](https://github.com/user-attachments/files/17547804/bella-tall.epub.zip)

This is also something that we've been requested on mobile toolkits. I thought of adding information about the column index + column count of the current resource in the "moved"...

By the way I recently added this in the Swift toolkit which can be used to calculate this info: https://github.com/readium/swift-toolkit/blob/1c89282c2220841e37cce1a481dee91dd7c54f57/Sources/Navigator/EPUB/EPUBNavigatorViewController.swift#L135-L145

Yes that's the one, let's talk about it later then 👍

Yes these are the changes part of the mobile toolkits v3. Here's a summary of the related changes: - `Resource` is simplified and doesn't have any notion of `Link` anymore....

Here's the Swift PR for reference: https://github.com/readium/swift-toolkit/pull/602

Are you able to share the license and passphrase with us? You also didn't write down which version of Readium you are using.

Could you share the downloaded EPUB file?

I could open the book without issue, are you sure this is the one that gives you an error with `publication.metadata.identifier` being `nil`?