This template does not persist any of the Paperless-ngx data.
On every redeploy, all static files, media, documents, and the internal data directory are deleted because none of the required Paperless paths are mounted to a volume:

/usr/src/paperless/data

/usr/src/paperless/media

/usr/src/paperless/export

/usr/src/paperless/consume

Only /data is mounted, which Paperless-ngx does not use unless properly configured.
As a result, redeploying the service wipes everything.

Please update the template so these paths are included in the volume mapping, or configure the proper environment variables.