Step 1: Quit being so popular... Step 2: Once you are logged in, click the "Notifications" option in the upper right hand corner of the DFP window, then Step 2.5: Click the "Inbox' option .
Step 3: Select/click the boxes to the right of the messages you'd like to delete:
Step 4: Scroll down to the bottom of your messages and click and option called "Selected Messages." Step 4.5: Click the "Delete" option, then the "Proceed" option. .
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I Definitely always download my sent folder... always packed full of info & Attachments
Hopefully your viewing this on a computer... click that arrows on bottom right corner... it will make it expand so you won't need your bifocals ...LOL > right-click the video, and you can "Save video as"... so you can watch it again, next time your inbox gets full