title: Why doesn't the download function work from app deployed on heroku
body: <pre><code>global down_path
  down_path = os.path.join(os.path.expanduser('~'), 'TempDownload')
  if not os.path.exists(down_path):
      os.mkdir(down_path)  # 如果不存在这个logs文件夹，就自动创建一个    
  filename = os.path.join(down_path, localnow+'ssc.tif')
  geemap.ee_export_image(ssc_intial, filename=filename, scale=110, region=roi, file_per_band=False)
  </code></pre>
  <p><a href="https://i.stack.imgur.com/gHtNy.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gHtNy.jpg" alt="enter image description here" /></a></p>
  <p>When I clicked the button to download the file, it didn't work. But when I run it via a local host, it works perfectly</p>