Whether internal or not, leaving comments and uploading files works the same. To leave a comment, select the “Comment” or “Internal Comment” button, compose your message in the cell below, and press “Send” to attach your message.

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To upload a file, select the “Files” or “Internal Files” button. 

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Then, select “New File” and upload directly from your computer or Google Drive.

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Once uploaded, you can review any attached file by simply selecting it, and the file will automatically download onto your computer. To remove a file, select the trash can icon next to it and confirm the deletion.