As explained by the vendor in the ratings here : https://marketplace.atlassian.com/plugins/de.polscheit.jira.plugins.gantt
Here is the relevant expcert :
So, I have decided to focus on concrete support requests and have just embedded basic docu on the plugin's main configuration tabs (secure/GanttAdmin!default.jspa) rather than writing much wiki pages.If you have any specific scenario not knowing how to solve it with my Gantt-Chart addon, please do not hesitate to contact me per email at firstname.lastname@example.org.
there is only a basic documentation available, most documentation is found inside the plugin.
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