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How do I download all files attached to a message?
Answer
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Gmail makes it easy to download multiple files attached to one message. When you receive a message with more than one attachment, you can download them all at once, in a zip file. Just click ‘Download all # attachments’ at the bottom of your message, and follow the prompts.

You can save your new zip file with all the attachments to your computer, or you can open it without saving.