Display Issue opening files via Sharepoint "Open in App"

1. Basic troubleshooting steps
 Check file type association
Test if different file types (e.g. .docx, .xlsx, .pdf) all have problems
Right-click the file > “Open as” > select the correct default application.
 Clear the client cache
Close all Office applications
Delete the local cache:
Windows: %userprofile%\AppData\Local\Microsoft\Office\16.0\WEF
Mac: ~/Library/Containers/com.microsoft.Office/Data/Library/Caches
2. Frequently Asked Questions Fixes
 Files can't be opened/Errors reported
Reset the Office app:
Open Word/Excel > File > Accounts > Reset Settings
Repair Office installation:
Control Panel > Programs and Features > select Microsoft 365 > Changes > Quick Fixes
 File opens as blank/gibberish
Check if the file is encrypted or protected by IRM:
Try opening locally after downloading directly from the web version
Disable browser plugins to test:
Access SharePoint using Edge/Chrome no-trace mode
 “Unable to connect to the server”.
Check web proxy settings:
Ensure *.sharepoint.com is not blocked
Update the Office license:
Open any Office app > File > Accounts > Update License