How do I get attachments to work with Windows 10?

[Windows Central Question]

I installed Windows 10 yesterday and now files will not attach to my emails via Outlook Web App. In one instance, the paperclip icon did nothing. In another instance, the paperclip icon took me to the usual browse window, but the attach button did nothing. I need this function all day long in my work. How can I fix this?

 

[Mark Kaplan]

Why not use the Outlook client?