how do I delete a file uploaded via MailDrop

I took a video at work. It's company IP. I used my personal iPhone 7.

My iPhone is not connected to the company network or my work email. In order to get the video onto the company network, I tried to email it to my work email address.

File is 42MB, so iPhone suggested MailDrop. I did that.

Using MailDrop, I uploaded this file to iCloud and a link appeared in my work inbox.

Now I realize this video, which is company IP, must be removed from iCloud.

I already deleted the video from my iPhone. But the link in the email still works. When I click it, I can download the video.

How do I delete this file from the cloud and cause the MailDrop link to stop working?