SOLVED iPad Dropbox Edit Word Document (17-feb-2023)

The problem:

Unable to open office files (.docx .xlsx .pptx) using Dropbox on mobile phone or iPad. I can open the office files before, but I can't open office files today (using Microsoft Office 365). An error message will appear: "Sorry, ----.docx is stored in an unsupported server location" This video shows how to fix it! And it works.