Unable to edit a shared file with Excel Online

Hello,

I shared an Excel file with someone and until last week, he could edit this file with Excel Online without problems. But for a few days, this option is no longer visible.

I checked the file, and he is still a member and have the rights to edit the file.

There seems to be a bug with dropbox itself, see for yourself : I tried to reproduce the error and I searched within my personal files in the menu "Shared" -> "Links" (by the way, the links listed are not shared files... but anyway...).I found 1 Excel file which have the same problem :

- when I click on the three dots on the right, I don't have the menu "open with..."

- when I click on the name of the file, it opens on a new tab, directly in Dropbox, and I don't have the menu "open with"

- when I am in this new tab, on the file, when I click on the arrow next to the blue button "Share", the submenu of this button loads, but there is also new options that load, and here appears my "open with" menu !

So in my opinion, there is a bug with the app. This is clearly not the expected behavior.

The only problem in the meantime is that the person to whom I shared the file with doesn't have the blue button "Share", and I didn't find any other button to trigger the loading of the menu...

What do you think ? Did anyone have the same problem ? Have you found a way to fix it ?

Thanks in advance.