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Fix Microsoft 365 App Not Opening PDFs on iPhone and iPad
Question details
Users are unable to open PDF documents using the Microsoft 365 iOS app after updating to version 2.76, receiving an error message instead.
- Product
- Microsoft 365 for iOS
- Device & OS
- iPhone and iPad (iOS)
- Scenario
- Attempting to view or access PDF documents within the Microsoft 365 mobile application after installing a recent update.
- Observed behavior
- The application displays an 'Error: File Open Failed' message and refuses to load PDFs, even though other file types and alternative apps function properly.
Verify that your PDF files are intact and not corrupted by attempting to open them in another application, such as Apple Books or the Safari browser.
Reinstall the Microsoft 365 App and Update iOS
Reinstalling the app clears out potentially corrupted cache files from the recent update, while updating iOS ensures maximum compatibility.
Software updates can sometimes leave residual cache files that cause sudden glitches, especially when handling specific file formats like PDFs. Performing a clean reinstallation alongside an iOS system update is the primary method to clear these conflicts.
On your iPhone or iPad home screen, press and hold the Microsoft 365 app icon. Tap 'Remove App', and then select 'Delete App' to completely remove it from your device.
Navigate to your device's Settings > General > Software Update. If a new version of iOS or iPadOS is available, download and install it.
Open the Apple App Store, search for Microsoft 365, and tap the download icon to install the latest available version.
Launch the freshly installed Microsoft 365 app, sign in to your account, and attempt to open the previously failing PDF document.
Access PDFs Directly via the Dedicated OneDrive App
Since the bug affects the unified Microsoft 365 app, using the standalone OneDrive app bypasses the PDF viewing issue completely.
Report the Version Bug to Support Teams
When troubleshooting steps fail, formally reporting the software bug helps developers release an urgent patch for the iOS application.
Open and Edit PDFs on iOS Seamlessly with WPS Office
If software bugs in other apps are disrupting your workflow, switch to WPS Office. It is a free, lightweight, and highly stable alternative for your iPhone and iPad, allowing you to read, annotate, and manage PDFs and Office documents without experiencing version-specific errors.
- 1. Download WPS Office: Get the free WPS Office app directly from the Apple App Store.
- 2. Import your Files: Connect your preferred cloud storage or open local files directly within the WPS app.
- 3. View and Edit PDFs: Tap on any PDF file to seamlessly open, read, or annotate it without errors.
Frequently Asked Questions
Why does the Microsoft 365 app say 'File Open Failed' for PDFs?
This error is typically caused by a bug introduced in a specific app update, such as version 2.76, or by conflicting cache files within the iOS environment that prevent the app's internal PDF viewer from rendering the file properly.
Can I roll back the Microsoft 365 app to a previous working version on my iPhone?
No, Apple's iOS ecosystem does not natively allow users to downgrade applications to earlier versions once they have been updated through the App Store. You must wait for a newer patched version or use an alternative app.
Are my PDF files corrupted if they won't open in Microsoft 365?
Not necessarily. If your PDF files open without any issues in other applications like Safari, Adobe Acrobat, OneDrive, or WPS Office, your files are completely safe, and the problem is isolated to the Microsoft 365 application itself.
What is the best free alternative to open PDFs on an iPad?
WPS Office is highly recommended as a comprehensive, free alternative for opening PDFs and Office documents. You can also use built-in tools like Apple Books or the Apple Files app for basic PDF viewing.
