can't attach files in windows app or outlook plug in
I'm unable to attach files from the Outlook plug-in or Windows apps. I get a popup box that says "Upload files, documents or images". When I get to this point either in the Firefox plug-in or web interface, I get a dotted-outlined box that I can drag and drop files into. In the Windows app and Outlook plug-ins I don't get this box; instead I get a button that says "Choose File" but it doesn't do anything when i click on it.
Thank you for your help!