Yes, we support attaching documents to your emails when sending via your saleslifecycle.com account. Documents can be up to 10MB in size.
From the email composer: select the 'attach a document' option higlighted below
From there a new popup window will open allowing you to select from previously uploaded documents or letting you upload a new one.
Once you have selected or uploaded the document you wish to attach the document will now be listed in the composer window
The last thing to point out is that this document will now show up in the contacts page