Hello @FlightOpsSMS ,
In order to best comply with delivery expectations and security programs, attachments are not currently viable to include in mass email marketing systems like ours. Documents need to be hosted in account libraries or in external sites, and linked to in emails. This isn't something currently on our roadmap.
If your contacts are regularly unable to access the internet when needing to access the documents, they'll need to download them to their device at a time when they are viewing them.
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