title: Dash Plotly Share Callback Input in Two Pages
body: <p>My Dash App is currently of two pages besides the index page, and it consists of the following files.</p>
  
  <pre><code>App.py
  index.py
  app1.py
  app2.py
  </code></pre>
  
  <p>I have a slider on page 1 of the app, namely in app1.py. The slider value is the input of a callback to make a plot on page 1 of the app.</p>
  
  <p>If I would like to use the same slider value for another callback in page 2 of the app to plot something else. How do I pass the slider value into app2.py?</p>