How to physically delete my attachments in "Manage Attachments"?

[vicelover]

Hi,

If users want to delete their attachment in "Manage Attachments" by themselves, how to? See the below picture, how to delete them if I want to.
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I tried to delete them from UCP, (see below pic ) but I failed. It seems that, deleting attachments from UCP is only delete the files in the relative thread or post.
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Thanks in advanced.