The error message you received regarding password-protected Excel files on OneDrive may be due to restrictions with the app's capabilities. Here are some possible reasons for the issue you faced: 1. App Compatibility: OneDrive on iPhone may have limitations when it comes to opening password-protected Excel files compared to other cloud services like Dropbox. The specific app design and features affect its ability to handle certain types of files. 2. Security Protocols: OneDrive may not support opening password-protected Excel files due to security restrictions or authentication issues within the app itself, which are implemented to ensure data security and integrity. 3. File Format Handling: Different cloud services...