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Hi Mohamedheshamshawki, 

Hope you are doing well. 

We are sorry, you're having difficulties. Please help me with few details to understand your issue better. 

1.  Make and model of your device? 
2. Application version? 
      

We did try to replicate the behavior on our end, however, it is working fine. Make sure your application is updated. Reboot your device and then try. Try to reinstall the app once.
For Android Adobe Reader Mobile version: 21.3.0.17414 

For more help refer to: https://www.adobe.com/devnet-docs/acrobat/android/en/troubleshooting.html

Let us know how it works at your end. If you have any further queries please feel free to reach out to us.  

Regards

Ria