Within the Skill, you need to wrap the Excel source data with base64(). Happened to me so much at the beginning before I figured that out.

Hi matt.witty13

Can you describe the solution in details. How I can achieve it?

In your skill, I’m assuming you have a section for when you pass the CSV. You need to wrap the CSV you’re sending with base64(). This encodes the CSV properly when it is going out in the email