File preview was not working in Confluence, so I searched for information and found that it was working in Sandbox. So how can we find out how the sandbox works?
I don't understand the question, but here is the general documentation of the feature:
https://support.atlassian.com/organization-administration/docs/manage-product-sandboxes/
Note that if these are images that you want to preview, then maybe those were not copied together with other media files?
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