8. How to Quickly Add Multiple Attachments to an Email
If an email you're sending requires you to add multiple attachments, there's an easier way than selecting and uploading files one-by-one.
If you want to send multiple files from the same folder, hold down the Ctrl key (or Command key on Macs) and click on each file you want to attach to your message. Or, you can also hold down the Shift key to select a continuous group of files.
Another option is to click and drag file icons from a folder or your desktop directly to the "Attach a file" section. When you do, the area will change to white and display this message: "Drop files here to add them as attachments."