How to Fix Acrobat for iOS Cannot Combine Multiple PDFs
Question details
The user is unable to combine approximately ten multi-page PDFs using Adobe Acrobat for iOS. The process stalls completely, and the files in progress cannot be selected or deleted.

- Product
- Adobe Acrobat for iOS
- Device & OS
- iOS
- Scenario
- Attempting to merge multiple multi-page project PDFs into a single file on an iOS device.
- Observed behavior
- The combine operation does not finish, leaving the app stuck, and the involved PDF files become locked and cannot be selected for deletion.
Ensure that your iOS device has enough free storage space to process large multi-page PDF files, and check that you are connected to the internet.
Switch to a Stable Wi-Fi Network
Combining large PDF files on mobile data can cause the process to stall. Switching to a strong Wi-Fi network ensures a stable connection for cloud-based merging operations.
Acrobat for iOS often relies on Adobe's cloud services to merge multiple files. When using a weak or unstable mobile data connection, this file upload and processing cycle can time out, causing the app to hang.
Navigate to the home screen of your iOS device and open the 'Settings' app.
Tap on 'Wi-Fi', toggle it on, and select a strong, stable network to connect to instead of using cellular data.
Force close the Adobe Acrobat app by swiping it away in the iOS App Switcher.
Reopen Acrobat and attempt to use the Combine feature again over your new Wi-Fi connection.

Clear Stuck Files by Refreshing the Account Cache
If files are stuck in a processing state and cannot be selected for deletion, signing out and back in will refresh the app's connection to the document cloud.
Easily Combine PDF Files Using WPS Office
WPS Office provides a highly reliable PDF management toolkit right on your iOS device. It allows you to merge multiple multi-page PDFs smoothly without being completely reliant on unstable mobile data connections.
- 1. Download WPS Office: Install WPS Office from the App Store and open the app on your iOS device.
- 2. Access PDF Tools: Tap on the 'Tools' or 'PDF' tab at the bottom of the screen, then select 'PDF Merge'.
- 3. Select Your Files: Choose the multiple PDF files you want to combine from your device storage or cloud service.
- 4. Merge PDFs: Arrange the files into your preferred order and tap 'Merge' to instantly generate your combined document.

Frequently Asked Questions
Why does Acrobat for iOS get stuck when merging PDFs?
Acrobat for iOS heavily utilizes Adobe Document Cloud to merge files. If you are using a slow or intermittent mobile data connection, the upload process can fail or time out, which causes the application to hang during the merging process.
How can I delete a PDF file that is stuck processing in Acrobat?
If a file cannot be selected for deletion because it is stuck processing, force close the app first. If the problem persists, sign out of your Adobe account within the app's profile settings and sign back in. This will force the app to refresh its cache and release the locked files.
Is there a way to combine PDFs on iOS without using mobile data?
Yes, switching to a Wi-Fi network ensures cloud-based apps process files smoothly. Alternatively, you can use built-in tools like the Apple Shortcuts app or robust third-party alternatives like WPS Office that can handle local file processing securely and effectively.




