In order to add an attachment to a session, you will need to first create the session.
After the session has been created, click on the "+" sign from the mastermind overview page to reveal the sessions under your Modules.
Click on the session title to access the session detail page.
On the session detail page, click the Add New Attachment button on the right hand side of the page.
Give your attachment a Title and Description and upload your file. Then click Create Attachment.
Limit is 1GB and formats acceptable are pdf, doc, docx, html, htm, xls, xlsx, odt, ods, odp, ppt, pptx, txt, rtf, zip, key, mp3, jpg, jpeg, png, gif, tif.