Here is a list of things that might be causing the issue and the corresponding steps to resolve it:

1. Check if your phone’s storage is not full or nearly full, if it is, try deleting some unnecessary files and programs.


2. Try restarting your phone to refresh the system.


3. Check if you have selected the default app to open the file with.


4. Check if the file is supported with your phone.


5. If the file is being received from an external source, check to see if the transmission is complete.


6. If the problem persists even after you followed the steps above, try uninstalling and then reinstalling the app that is associated with the file your trying to access.