Hey Everyone,
Thanks for your request!
This functionality is already available in SmarterMail.You can preview attachments like documents and PDFs without downloading them by using our Document Collaboration feature, which integrates with OnlyOffice and Collabora.
You can learn more about it here:https://help.smartertools.com/SmarterMail/Current/Topics/Marketplace/DocumentCollaboration/Overview
Kind Regards,
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