This feature is not available in the new editor I think (see https://community.atlassian.com/t5/Confluence-discussions/New-and-improved-file-uploading-experience-in-Confluence-Cloud/m-p/1234893#M6541)
However, if you have the image opened by URL in a separate table, you can right click the image and click 'Copy' and paste into the Confluence page.
That’s right! Grandma’s back at it again, and this time she’s brought all her friends. In honor of Team '21, this Bingo round is dedicated to all things team-related, and the prizes are no exception....
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