⁠Return signed documents to Nextcloud after completion in Documenso

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Feature request

Which Nextcloud Version are you currently using: (see administration page)

Nextcloud: 33.0.5 (self hosted)
Documenso: 2.11.0 (self hosted)
integration_documenso: 2.1.0

Is your feature request related to a problem? Please describe.

When sending a document for signing via the Documenso integration, the workflow is currently one-directional: files go from Nextcloud to Documenso, but once all parties have signed, there is no way to get the completed document back into Nextcloud automatically. To retrieve the signed PDF, you have to log in to Documenso separately and download it manually. This breaks the flow for anyone who uses Nextcloud as their primary document storage.

Describe the solution you'd like

Once a document sent through this integration reaches a completed state in Documenso, it should find its way back into Nextcloud without requiring manual action from the user.

Describe alternatives you've considered

Using a middleware tool (like n8n) to listen for Documenso webhook events and upload the signed document back via WebDAV. This works, but adds significant setup complexity and external dependencies for what feels like a core part of the integration's usefulness.

Additional context

Documenso supports webhooks for document lifecycle events (including completion) and has an API endpoint to download completed documents. Nextcloud's own webhook listener functionality could also be relevant here. The right approach is up to the maintainers, but the building blocks seem to be available on both sides.

Review the existing Nextcloud-to-Documenso sending workflow, then compare Documenso completion webhooks and its completed-document download API with Nextcloud's webhook listener and WebDAV upload options. The work is done when completed signed PDFs are returned to the appropriate Nextcloud location without manual retrieval, with the integration's existing behavior preserved.