Did you solve the issue? Just in case if anyone has the error that the NAS Share is not writable
?: PAPERLESS_CONSUMPTION_DIR is not writeable
HINT: Set the permissions of
drwxr-xr-x root root /share/paperless/consume
Solution: switch from CIFS to NFS share network mount following this thread:
https://community.home-assistant.io/t/new-backup-to-nas-how-to/579606/5