hi, but if possible load a file in sketch to Arduino.. and after play sound with a button and stop whit another button?
The Arduino by itself can't play MP3s. You need an [u]Audio Shield[/u]. The Arduino simply acts like a controller so depending on the particular audio board you may not even need the Arduino!
Also depending on the audio board you may need an amplifier to drive a speaker.
What is a nano 33 hot?
I know of the nano 33 BLE, the nano 33 BLE sense and the nano 33 iot.
These are all 3V3 devices and that board will probably not be directly compatible both in terms of physically mounting it on your nano and the voltage signals it returns to the nano.
With the nano 33 boards you can decode MP3 files Overview | Native MP3 decoding on Arduino | Adafruit Learning System but then you will also need an SD card board to hold your files.
But in truth you are better off forgetting the MP3 requirement and putting the sound into .wav format on the SD card. You will have plenty of room on the SD card and there will be no delay before you here the sound once triggered.