I can see from your screenshot that you are using a cloud instance.
Unfortunately if you look at the marketplace it says it's compatible with the server version.
Bit of a strange name for a plug-in if it doesn't support cloud.
The tech between Server and Cloud is completely different. I've built one add-on which shares code, we could reuse only 25% of the code for Cloud and we could implement only 60% of the features. We depend on whatever framework Atlassian builds, and Atlassian Connect is completely different from Atlassian Plugins 2.
Two vulnerabilities have been published for Confluence Server and Data Center recently: March 20, 2019 CVE-2019-3395 / CVE-2019-3396 April 17, 2019 CVE-2019-3398 The goal of this article is...
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