When selecting 50 or more files to download, or the total download size is more than 100MB, Flight will automatically convert the download to a zip file. The .zip file will be sent to your email address.
After selecting multiple files and choosing the bulk download option, you'll be prompted to name the .zip file.
Click Apply. You'll see a window notifying you to check your email.
From your email, click the download link to download the .zip file.