Can't open PDF files with new beta on my mac

I too am having this problem with the latest Beta of Dropbox v163.3.5425 but not just with PDFs, it is happening with all files.

I'm running the Beta on a backup machine (Mac M1 2020) that is running macOS Ventura 13.0.1

I have followed all the instructions on this thread and none work.

This is what happens (All MS Apps) - When I double click a Microsoft document (Word/Excel/Powerpoint) that is in my Dropbox (now located in ~Libraries) the document downloads (great) and then opens in Dropbox.com in my browser (not so great). I want the file to open in the native application (Word/Excel/Powerpoint) on my Mac so I follow the instructions as follows (Using an Excel doc as the example here):

Right-click the file > Get info > Open with: (this says Dropbox) so I Change to Microsoft Excel from the list (that in fact has 'Default' in brackets beside the title).

I immediately get a Finder message pop-up saying:  "You don’t have permission to change the application for this document only. Do you want to change all similar documents to open with the application “Microsoft Excel”? "This change will apply to all documents with extension “.xlsx”."

Brilliant I think. This is exactly what I want. So I click continue... double-click the file in question again and voila. It opens in Excel on my Mac. Fantastic...

...problem is that when I try to open any other Excel doc in my Dropbox by double clicking, it downloads but we're back to square one and it opens in Dropbox.com in my browser so clearly the instruction to "change all similar documents to open with the application “Microsoft Excel?" hasn't been applied by Finder to files within the Dropbox folder.

Exactly the same thing happens with Adobe Files (Acrobat PDF, Illustrator AI, Indesign INDD) with the only difference being that they don't open in Dropbox.com in my browser; they just magnify momentarily on double-click after downloading as if they are about to activate the corresponding Adobe App but nothing happens.

I go through the same process with them; Right-click the file > Get info > Open with: (this says Dropbox) so I change to native app from the list (that again in fact has 'Default' in brackets beside the title).

I immediately get a Finder message pop-up saying:  "You don’t have permission to change the application for this document only. Do you want to change all similar documents to open with the application “[this is the adobe app in question and corresponds to the file type]”? "This change will apply to all documents with extension “[this is the extension for the Adobe file type in question]”."

Again I click continue... double click the file in question again and voila. It opens in the native Adobe App... but...

Exactly as with the MS files when I try to open any other file of the same type in my Dropbox by double clicking, it downloads but we're back to square one and it just magnifies momentarily on double click after downloading as if they are about to activate the corresponding Adobe App but nothing happens.

Again clearly the instruction to "change all similar documents to open with the application “[the Adobe file type in question]" hasn't been applied by Finder to files within the Dropbox folder.