My company thinks to move technical documentations online as a Confluence spaces. Right now, we are investigating importing options. Does Confluence have these import options built-in or external.
Ok, then I'd go with what Steven said for XML and probably HTML.
LaTeX is a different story - translating those into Confluence is pretty much nonsense as you'll lose most of it. However, I would import the files as plain text and wrap them in macros from https://marketplace.atlassian.com/plugins/com.stepstonetech.confluence.plugins.latex/server/overview
Well, you have a few options.
There is the UWC Converter, which is unsupported and may not work on the latest version of Confluence (you should install it in a test instance) which you can use to import some formats.
There is also a plugin for Confluence Cloud, Confluence Universal Importer. You may be able to sign up for a trial version of Confluence Cloud, import the pages, re-export, and import into Confluence Server (since you are running the latest version of Confluence Server, this should work, but you should check with Atlassian support before trying this method).
Finally, the best method would be to use a custom solution that pulls the information needed from the XML files and saves Confluence pages using the REST API. This would require some programming and knowledge of the Confluence API (most languages support some sort of framework for Confluence, so that might at least make this easier). However, this is the only way to fully guarantee a successful conversion of pages into the proper format.
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