I used to have no problems doing attachments in webmail. Now when I want to attach a photo or document, I get bounced right out of the compose window. The original email is saved as a draft. When I select the file(s) I want to attach, nothing happens when I press "done". When I try to get back to the email, I has been saved as a draft, and there is no way to save attachments to a draft. I am using Windows 10.
@162109 hmm, that's very odd. Have you tried using your webmail in different web browsers and disabling all 3rd party extensions to see if the attachments work? Also, are you using Ajax or HTML format (Ajax will work normally)?