
Dear Maurice
I completely understand how frustrating it can be for you. I will make sure this get the attention it deserves.
Recent updates to Excel and Word apps on iPhone are causing issues with maintaining a stable connection to Dropbox, prompting many users to face similar challenges. I will provide you possible solutions which might help you to solve your issue.
Reinstall Apps: ****
A common troubleshooting step has been to uninstall and then reinstall both the Excel and Dropbox apps. After reinstalling, ensure to reconnect to Dropbox to see if the issue is resolved"
Check for Updates: Ensure both the Dropbox and Microsoft Office apps are updated to the latest versions. Sometimes, bugs are fixed in subsequent patches after major updates
Use the iOS Files App:
As a workaround, access Dropbox files through the iOS Files app. This method allows you to open these files directly in the respective Office applications without losing connectivity
I am attaching some solutions which might help you to solve your issues.
Connecting to Dropbox on Word/Excel/PowerPoint - Microsoft Community
Word & excel for iPhone can no longer connect to dropbox - Microsoft Community
This Might solve your issue if they don't you can contact Microsoft support for further assistance.
Microsoft Support
Zoro | Microsoft Community Support Specialist