It is 2025 and I have found requests for this on your site going back to at least 2018. Unfortunately, this doesn't look like a priority for Constant Contact, but it IS a priority for many of your users.
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Click the checkmark boxes of the files you wish to remove. Then click the Delete button that appears at the top of the list. From there you can empty your trash.
For a full rundown of removing files from your Library
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