I am trying to make use of the custom action post action on Webflow, as demonstrated in this tutorial. I am using a newsletter software called “sendinblue”. The form submit works fine. However, every time I submit the form, instead of staying on the page as I would like to, the submit button redirects me to an empty page from sendinblue. It also doesn’t change into the success message on the webpage – I am not sure how to change that.
I have tried leaving the redirect URL empty or change it into a different page, to no avail.