Our confluence is not hosted by us so can i add the plugin in question without installing confluence on our servers?
Hi Michael, welcome to the Atlassian Community.
If you are referring to this plugin PlantUML for Confluence can't. Confluence Cloud and Confluence server/ datacenter are technically different. Plugins have to be developed separately for each deployment type so you can not install a server plugin into Confluence Cloud.
Take a look at alternatives: https://marketplace.atlassian.com/search?hosting=cloud&product=confluence&query=PlantUML perhaps there is one that suits your needs.
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