Failed to load resource: the server responded with a status of 403 ()

I have an application based on Ember (as SPA). I'm doing the deployment in Firebase Hosting. Also I have a Rails application that works as an API provider. Rails application has on board GraphQL. Also Rails application has a connection with Google Storage.

In one of the Rails requests, the application returns a list that contains links to the images:

https://files.site.com/uploads/image/file/88/7d/5a/0ab3beg2fea0af6c.jpg

If I insert a link in a new browser tab, an image is opened.

But on the SPA page I see such errors (in the list, for example, 12 items):

Failed to load resource: the server responded with a status of 403 ()
Failed to load resource: the server responded with a status of 403 ()
Failed to load resource: the server responded with a status of 403 ()
# etc

What could be the problem?