I've run into the same issue that you have all described and I find it absolutely ludicrous that this has changed. As @Roland12 has pointed out - what's the point of uploading a document, just to download it again to view it later!!! The whole point of uploading a document is to actually view it online in the browser.  I have just migrated 2 companies to QBO and now run into this issue and can't believe what I'm dealing with.  I have a 3rd company I'm ready to pull the trigger on to migrate to QBO but with this issue I'm having 2nd thoughts.  When I contacted QB support, they told me I can no longer view attachments in the browser and have to now download them.  Crazy!!  Thank you for this thread as I will now try to stop banging my head against a brick wall and hope QBO comes to their senses and re-instates the way attachments were able to open in the browser as before.