code: protected function runUpload($file)
      {
          $this->provider->setFile($file);
  
          if (! $this->provider->isValid()) {
              throw new InvalidFileException("Given file [{$file}] is invalid.");
          }
  
          $filename = $this->getFullFileName($this->provider);
  
          if ($this->filesystem->disk($this->disk)->put($filename, $this->provider->getContents(), $this->getVisibility())) {
              return $filename;
          }
  
          return false;
      }
docs: Upload the given file and returns the filename if succeed.
  
  @param  string  $file
  @return string|bool
  
  @throws \Rymanalu\LaravelSimpleUploader\InvalidFileException