Hi @Priscilla_Hoover. Attaching a file in the broadcast builder is actually managed similar to creating a hyperlink. If you highlight your text, in the format bar, you can click the Hyperlink icon, and adjust the link options from “URL” to “File Download” in the dropdown.
From here, you will have the ability to either choose an existing file that you have uploaded to Infusionsoft, or upload a new file from your computer.
Here is a quick little visual I recorded in my app, showing highlighting text, and setting it up to be an ‘attachment’ link. 2017-09-11_1400