Arduino UNO R4 Minima - I can send keystrokes, or I can control a stepper motor. But I can't do both things in the same sketch

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Thanks Paul,
I have found that every time i call the Keyboard.releaseAll() function I receive a line feed character.
I modified the source code to ignore it.
My serial monitor input is regularly received, but the stepper is still inactive.
It must be an issue of incompatibility among libraries.