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- Add app/tasks/upload_to_user_integration.py: new Celery task that uploads a processed document to a specific UserIntegration using its own per-user config and Fernet-decrypted credentials. Supports all DESTINATION types: Dropbox, S3, Google Drive, OneDrive, WebDAV, Nextcloud, FTP, SFTP, Paperless-ngx, Email (SMTP), and Rclone. - Extend app/tasks/send_to_all.py: add send_to_user_destinations task (queries active DESTINATION UserIntegrations for an owner and dispatches one upload_to_user_integration task per integration) and get_user_destination_count helper used by finalize_document_storage. - Refactor app/tasks/finalize_document_storage.py: after processing, look up the document owner; if the owner has active DESTINATION integrations route exclusively to those (user-specific routing), otherwise fall back to the global send_to_all_destinations. - Update tests/test_finalize_storage.py: add autouse fixture to prevent Redis hangs, update all existing tests with new mock parameters, add TestFinalizeDocumentStorageUserRouting class with four new tests that validate user-specific vs global routing decisions. - Add tests/test_user_integration_upload.py: 14 new unit tests covering upload_to_user_integration (handler dispatch, error persistence, last_used_at update, credential decryption, skip for unknown types) and send_to_user_destinations / get_user_destination_count. - Update docs/StorageArchitecture.md: document the user-specific destination routing feature, supported types, multiple-destination behaviour, and global fallback semantics. Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>