Adding attachments to the templates sounds interesting especially if you’re trying to launch a special campaign with a nice catchy design.
Attachments to email templates
We presently don’t allow attachments to email templates.
We recommend hosting your attachment files on your website or a file hosting service and adding the link to download it in your template call to action.
This has the following advantages:
- If need be, you can update the file at the link source.
- This is useful if the attachments need urgent changes after the emails have been sent out.
- It increases the reachability of your emails:
- As it lowers the email spam score.
- And you’ll be sending smaller-sized outbound emails.
Attachments to text templates
Adding an attachment to your text template will change the SMS text into an MMS.
In Settings > Templates > Add text template > Choose file 
In such cases, you want to consider counting the characters included in the text to avoid your text being counted as multiple segments and being overcharged for them.
To prevent such incidents, we recommend hosting your attachment files on your website or a file hosting service and adding the link to download it in your template call to action.