Hi everyone,
Let us respond to you one by one 
@Vincent_London, we have received your feedback from the demo page and will get back to you soon via email. Let’s continue our conversation over there please 
@grgrsmth, we have discussed this with the developers. The reason for using Heroku is due to changes in browser policies for fetching images. We will create an investigation for the developers to check this behavior further and will update you as soon as possible. We are sorry for this inconvenience 
@daviddr17, could you confirm that you were using private Bubble images? We tried removing the HTTPS in front of the URLs, but errors were still present.
Best regards 