Reacted with to macom’s post in the thread OMV 4.x Nextcloud with Letsencrypt using OMV and docker-compose - Q&A.Reaction (Post)Worked for me. Three warnings after upgrade in the securty check, which could be solve by
sudo -u abc php occ db:add-missing-indices
sudo -u abc php occ db:add-missing-columns
I redeployed the Nextcloud container and made sure the latest image was pulled.