If you’re using Internet Explorer 9 or lower, or Opera 11.6 or lower, then you won’t be able to select multiple files at once from the file picker. You can still queue up multiple files for upload, you’ll just have to select them one at a time.
Hey there! We’re experiencing a high volume of emails at this time and our response times are slower than usual. In the meantime, we’ve put together a list of common questions to help. We appreciate your patience.