I searched a lot for this question in these last days and any answer that I saw until now it couldn't help.
I'm developing an app with React-Native and after trying with a lot of modules to send push notifications, I decided to use the services of Backendless.
Their system works very fine but I can't find an answer to what or where change to show a custom icon instead of the default white square in the notification.
I inserted the meta-data firebase.messaging.default_notification_icon in AndroidManifest.xml, I tried to make modifications in the function that set icon inside of the backendless module, tried to use Android vector drawable instead of png and some others things, everything I tried not worked.
Has someone any suggestion?
Thanks