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Hello, We understand how important it is to be able to view your important documents. We recommend clearing the app cache and restarting the phone when an app is not behaving as expected. https://www.samsung.com/us/support/answer/ANS00077611/
Another troubleshooting step to try is uninstalling and reinstalling the app.
If these steps do not help, we recommend reaching out to the app developer for further assistance.