The "Attachments" option can be found in some of the application's sub-menus and is useful when you want to store documents related to your transactions. In essence, Elorus works like cloud storage service and each file can reach up to 3MB in size. By pressing the "Attachments" button that exists within each record's page, you can upload as many files as you wish (one at a time), making sure they do not exceed this size.
This function is available:
for each contact
for each purchase or sales document, debit or credit
for each estimate
for each receipt / payment
Specifically, with respect to sales documents (debit / credit or offers) attachments appear as an option when sending e-mail to the contact, as well.