This question is in reference to Atlassian Documentation: Uploading Files
Can I attach a zip file in Confluence?
Of course, you can attach any type of file to Confluence. If it's not a recognized filetype, it will simply not show any preview (i.e. it won't show you what's inside the zip file), but there is no problem with uploading/downloading. You just have to make sure to stay within the file size limits of Confluence set by the Confluence Administrator.
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