JIRA, on it's own, is an Issue Tracking software. Though you can attach "documents" and/or "files" to issues related to a single project, it's not optimized to be a "document management" like what you briefly describe.
Sounds like Confluence can do what you need, but I'm not entirely sure what is your requirement or process. Take a look at that. It has some cool features on how it handles documents (like versioning, tracking etc...)
Yes they can be combined. Read the documentation here (https://confluence.atlassian.com/doc/integrating-jira-and-confluence-2825.html). You will be able to display JIRA issues in the confluence pages for reporting and display JIRA Gadgets too. Confluence Activity Stream can be added in a JIRA Dashboard. Try it out :)
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