If you're talking about Zen foundation theme, I am afraid you are unable to do so based on restricted function on ondemand. Also if you would like to install certain plugin, only certain plugin is allowed to be installed in OnDemand as Nick mentioned. Apart from that, you can't install any plugins. Perhaps you could move to Download version as it gives you more flexibility.
Hope this information helps. Cheers.
Hi Community! Kesha (kay-sha) from the Confluence marketing team here! Can you share stories with us on how your non-technical (think Marketing, Sales, HR, legal, etc.) teams are using Confluen...
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