How to remove media library pro original photo?

thanks, am trying to remove media library pro original photo, I mean I want to make the upload of the image and convert it, then DELETE the original file, the files can be very heavy so I will just need to keep the converted images, how to do that?

Thanks in advance.

I want to write something LIKE this

$this->addMediaCollection('exam')->removeOriginal();

hope to make sense ----- the code so far...

public function registerMediaCollections(): void
	{
		$this->addMediaCollection('exam');
	}

    public function registerMediaConversions(Media $media = null): void
    {
      $this->addMediaConversion( 'thumb' )
      ->width(300)
      ->height(300)
      ->sharpen(8)
      ->performOnCollections( 'exam' );

      $this->addMediaConversion( 'C800' )
      ->width(800)
      ->performOnCollections( 'exam' );


  }