@유진 원 - Thanks for the question and using MS Q&A platform.
If you are trying to open a protected file on your Android mobile device, and it does not open properly, then you will likely need to use the Azure Information Protection mobile viewer for Android. The AIP mobile viewer for Android enables you to view protected emails, PDFs, images, and text files that cannot be opened with your regular apps for these file types.
The AIP mobile viewer for Android supports the following file types and environments:
For more details, refer to View protected files with Microsoft Purview Information Protection viewer.
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