Docker Container keeps restarting - Troubleshooting Nextcloud

This case, it was already working. Ended up pulling a new image but didnt know it.  
 First, check docker logs. Run the container and let it keep restarting so that it will give you an error log.  
 docker logs <nextcloud_container_name> 
 Error said: Initializing nextcloud 31.0.1.2 ... Can't start Nextcloud because upgrading from 29.0.0.19 to 31.0.1.2 is not supported. It is only possible to upgrade one major version at a time. For example, if you want to upgrade from version 14 to 16, you will have to upgrade from version 14 to 15, then from 15 to 16. 
 That means files/data is for version 29 and i need to incrementally go up to V31. 
 Lets get the versions in between to install it correctly. 
 If the containers are running. stock them. 
 docker-compose down 
 Check Your Current Data 
 Your Nextcloud data (files and database) is tied to version 29.0.0.19. Ensure your volumes ( ./nextcloud and ./mariadb ) are intact, as they contain your files and database. If you have backups, now’s a good time to confirm they’re ready—just in case. 
 Upgrade Step-by-Step 
 You’ll need to run intermediate versions of Nextcloud to perform the upgrades. Modify your docker-compose.yml to pull specific versions, starting with the next major version after 29. 
 Upgrade Step-by-Step 
 
 You’ll need to run intermediate versions of Nextcloud to perform the upgrades. Modify your docker-compose.yml to pull specific versions, starting with the next major version after 29. 
 
 services:
 nextcloud:
 image: nextcloud:30
 # ... rest of your config ...
 mariadb:
 # ... no change needed here ... 
 
 Start the containers: 
 
 docker-compose up -d 
 
 Check the logs to confirm it’s running: 
 
 docker-compose logs -f 
 
 Nextcloud should automatically run the upgrade process for version 30. Wait until it stabilizes (logs should stop showing errors and indicate a successful start). 
 
 Upgrade to 31.0.x 
 
 Once version 30 is running fine, stop the containers: 
 
 docker-compose down 
 
 
 Update docker-compose.yml to the desired version (31.0.1.2 or latest 31): 
 
 
 services:
 nextcloud:
 image: nextcloud:31
 # ... rest of your config ... 
 
 
 Restart: 
 
 
 docker-compose up -d 
 
 Check logs again: 
 
 docker-compose logs -f 
  The upgrade from 30 to 31 should proceed. Once complete, your Nextcloud should be fully operational on 31.0.1.2.