How to attach a pdf in an email - Zoho CRM

How to attach a pdf in an email - Zoho CRM

Hi,

I have a campaign to request for a whitepaper and I want to link to that whitepaper pdf in the thank you mail I send.
Unfortunately I do not understand how to do this, and were I need to store that file so that all people can access this pdf.
Should I upload this pdf in Zoho, or put it somewhere else?
Any suggection?