You cannot upload Server Plugins (.jar files) into Cloud. This is unsupported, see: https://confluence.atlassian.com/display/Cloud/Restricted+functions+in+Atlassian+Cloud+apps
It seems that there is no Cloud version of intelligentreports. You should ask the add-on vendor directly if they plan to implement one: https://marketplace.atlassian.com/vendors/1210642
Unfortunately Intelligent Reports is not currently available for cloud. There are significant differences in implementation required to support JIRA cloud and this has not yet been completed.
I will post a new answer to this thread if cloud support becomes available.
Thanks for your interest in Intelligent Reports,
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