Let me explain with pics...pics help make everything easier.

This is a computer/browser instruction and may/may not be different for those of you using Tapatalk.

At the top-right of your COAR page in your browser window, click on Settings

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Scroll/look down the menu list on the left side of the page under My Settings, then Miscellaneous you'll find Attachments - click on Attachments
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From here on it should be intuitive.