I used to be able to open Word or Excel documents in Dropbox by clicking the three dots by the filename and choosing "Open in" and selecting "MS Word" or "Excel." Now, on my desktop computer, I can choose only the web-based Word or Excel, and on my iPad, if I choose "Open in" and click Microsoft Word, nothing happens. I have Word and Excel installed on both these devices, and I have a Microsoft 365 subscription. Does anyone know why I am unable to edit my documents any more? Thanks for any help.