Images not showing

[FrancisMorelli]

Hi there.

I installed Nginx Proxy Manager to proxy reverse my application that is on a container.
This application uses an API that is on another conteiner with reverse proxy as well.
When the application calls the api to generate a qr-code, a png image, with https on, I can't see the image on the browser. But when I access the image with http, I can see the image.
An example address to the image is: http://sub.xxx.com:3000/rails/active_storage/disk/image.png

What can I do in order to fix it?