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To get the Re-Scan Template Attachments dialog, in the admin go to:
On that page, in each of the template set rows on this page, there will be a button named Re-Scan. You can click the re-scan button next to a template set you may wish to re-scan the templates for.
Use this to scan a template set's main_body/ templates, to find all the attached modules, addon tags, and sub-templates, and from what is found attached to each template, re-generate all the modules to template attachment files.
<tip c n>Tip: If a module or addon tag's contents is not displaying, use the re-scan tool to re-generate the attachment files.</tip>