The plantuml plugin (written by Michael Skrynski) is not compatible with Redmine 4.x or later.
How can we use it with Redmine 5.x ?
The plantuml plugin (written by Michael Skrynski) is not compatible with Redmine 4.x or later.
How can we use it with Redmine 5.x ?
Copyright © 2021 Jogjafile Inc.
There is a fork which has seemed to make the plugin compatible with a recent version of Redmine:
javister/plantuml
I checked out the commit 4e7a2e from the fork and tried to use it with Redmica 2.2.3. It worked well.