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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**I'm still stuck. **
Now, with a working loop and rock-solid "if's", we are back where we started.
The same commands, stepper.moveTo() and stepper.Run() that work flawlessly, cease to work as soon as i include Keyboard.h and add the lines related with that library (Keyboard.begin() etc...).