https://marketplace.atlassian.com/plugins/com.mxgraph.confluence.plugins.diagramly cannot be installed on this Cloud instance.
How can I upload this plugin?
Please, help!
You can't. Cloud has a limited list of addons you can install, and this is not one of them.
Get gliffy instead https://marketplace.atlassian.com/plugins/com.gliffy.integration.confluence#cloud
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