Highlight the importance of setting the property dl.store.impl properly before the upgrade

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 7.0.x, 7.1.x
• Component/s: Core Infrastructure
• Labels: None
• Type of Documentation: Deployment
• Git Pull Request: https://github.com/sez11a/liferay-docs/pull/4016,https://github.com/sez11a/liferay-docs/pull/4017

Customers usually forget to the set this property before the uprgade and it's mandatory in case they used com.liferay.portal.store.file.system.FileSystemStore

cc/ Cristina Rodriguez Roberto Díaz