The attachments on a binder in Vault are not included as part of a binder export.
This is working as designed.
Binders are treated as if they are containers of Vault documents. When a user exports a binder, the export contains all of the details about the documents within the binder. No data within the binder itself is exported (such as attachments, fields, etc.).
Vault Binder Documentation: Exporting Binders
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