You know whenever you go to include an attachment in an email, you have to upload each picture or file, one by one? Well now when you go to upload a file, you can hold down the Ctrl key (Cmd on OS X) and select as many files as you want. And say you have a whole list of files you want attached at once? Just hold down the Shift key to highlight all of them and they will all upload into the email attachment box. Easy peasy!