No se puede combinar archivos

Hi @Patty1119 

Hope you are doing well.

Thank you for posting your query here. Please help me with few details to understand your issue better.

1. OS version?
2. Application version?
3. Size of files?
4. Screenshot of error message?

We did try to replicate the behavior on our end, however, it is working fine. Make sure your application is updated. Do save your work then try to sign out and sign in back. Reboot your device. 
For Android Adobe Reader Mobile version: 21.4.0

For iOS Adobe Reader Mobile version: 21.03.00

For more help refer to:https://www.adobe.com/devnet-docs/acrobat/ios/en/managingsubscriptions.html#combining-files

*iOS- https://www.adobe.com/devnet-docs/acrobat/ios/en/troubleshooting.html

*Android- https://www.adobe.com/devnet-docs/acrobat/android/en/troubleshooting.html#get-help-and-find-answers

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