Paperless-ngx is a community-supported supercharged document management system: scan, index and archive all your documents.
Configure as required and ensure you set a PAPERLESS_SECRET_KEY (docs):
USERMAP_UID=1000
USERMAP_GID=1000
PAPERLESS_REDIS=redis://paperless-broker:6379
PAPERLESS_URL=https://paperless.example.com
PAPERLESS_SECRET_KEY=!secret
PAPERLESS_TIME_ZONE=Europe/London
PAPERLESS_APP_TITLE=Paperless
PAPERLESS_EMAIL_TASK_CRON=*/15 * * * *
PAPERLESS_TRAIN_TASK_CRON=30 */3 * * *
PAPERLESS_INDEX_TASK_CRON=40 0 * * *
PAPERLESS_SANITY_TASK_CRON=00 13 * * tue