Is it possible, that this combination doesn't work?
While installing OMV5 I got errors with LMV2, NGINX and OMV itself, as OMV5 needs both.
As my RasPI is my PiHole-central there allready is another webserver installed, lighttpd.
But shuting down lighttpd and installing nginx (yes it worked) didn't help with OMV.
Additionally I coudn't use the PiHole Admin Web-Site. Nginx doesn't want to deal with.
Am I right with thinking, that both won't work together?