Document Export Issue

Hi,

When I try to export a certain document in any format, nothing happens. Please find attached.

[Poster-02.txt](https://github.com/user-attachments/files/21564816/Poster-02.txt)

I am using the dev version of the app.

Thanks

Matt

Start by reproducing the export failure in the dev version using the attached Poster-02.txt document, testing each available format. Trace the export path from the document export action and identify why no output or error appears; done means the document exports successfully in every affected format or reports a clear failure.

索引モデルが issue の本文から書いたものです。