No es capaz de generar palabras escritas

While it has gotten better, Firefly (and most other AI image generators) is not good at putting exact text from a prompt into an image. Sometimes it is perfect, but usually, it does not get it right.  The best solution is to use Adobe Express or Photoshop to add text in.  The more complicated the angle or perspective of the text, the more likely you will need Photoshop to get what you want.