If you’re not comfortable with working more with coding for this part, I would suggest Make, since you have to handle the file attachment part as well.
They do have a generous free tier with 1000 ops/month.
Also, this thread shows you why it’s showing 302 errors.
Thank you for this sleuthing. It seemed from other research that it was Glide blocking/not following the redirect and that might be solved by using Make. Re the screenshot you posted. Yes a little out of my depth but maybe #3. But Is it possible to use GET instead of Post? Maybe in the API module? I think the webhook model doesn’t allow you to specify the method.