XF 1.4 After import, attachments all showing as thumbnails

I suspect they are using the basic attach code, rather than attach=full.
You have attachment viewing disabled for guests so only the thumbnails show anyway.

You could do a find and replace on [ATTACH] and replace with [ATTACH=full] in the post table.
You can do that as a query or using the post content replace add-on.

Take a backup of the database first before running any queries.
 
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