Maybe I am going crazy....but I cannot see a way to add audio to my portfolio, even though I have done this before. I have been through the steps several times and cannot see an upload link to add a voice over sample.
We apologize for the late follow-up. Please select the Classic template and you should be able to upload your audio sample as an attachment by dragging the file to or using the link from the Project Files section. Let us know if you need further assistance.