I did everything that happened on the stack, my download was successful, but nothing appeared. Trying to find a solution, I tried it, and it worked for me as well as for other people facing the same problem, can help others who find themselves here.
I posted it in the questions section to check it https://github.com/firebase/quickstart-ios/issues/413
One thing I did was move my test crash
Crashlytics.sharedInstance().crash()
to the first view controller, such as WelcomeViewController, and then after a crash, I closed and reopened my application. Then he just waited once, and he appeared.
Before doing all this, my test crash was in the view controller, which was part of the tabBarController, because maybe it was not the most important view controller, which caused the problem. After the first crash that appeared on the firebase console, my other crashes appeared.
source share