PUSH notifications on the application via Firebase why the picture does not come?

Question

Push technologies

Hello. I recently launched an application for the site, started to deal with PUSH notifications, and I had a question. Why doesn’t the picture come along with the notification, is the reason in the picture itself or is some function not configured in the application? When I fill out the form to send a notification through Firebase, there is an example picture, but a notification without a picture comes to my phone. What is the problem, please help.

Answer 1

Most often, this problem occurs if access to the picture is limited (for example, the picture is available only to the site administrator).
And it turns out that during the preview it is available on your device, but when the notification is shown, it is not.
You can try to open the link to the image in "incognito" mode, if it opens, then everything is in order.
It may also be due to the http protocol of the image, on some devices the image is required to be accessible via the https protocol.