You can integrate ActiveCampaign with DocumentLeads by configuring your leads to be sent to ActiveCampaign upon export.
First configure your ActiveCampaign account settings under Settings, Add-on Settings:
Next, configure your Lead Form fields:
Make sure you have the Newsletter Subscription option checked, and verify the Newsletter Details:
When someone visits your document page to view and download a copy, they’ll see a checkbox option to subscribe to the newsletter:
Once they click Download Now they’ll be sent an email containing a link:
Clicking “Download your file here” will download the file immediately, and the lead will appear under your DocumentLeads account under Captured Leads:
The individual is also added to ActiveCampaign automatically:
Here is some more information from the DocumentLeads site.