Google Nexus One - To Delete a Video

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NOUG-2.1-update1-105 Nexus One User’s Guide
Important If you are sharing an album via Gmail, do not delete the original of an attachment
before the message is completely sent (that is, it has the Sent label, not the Outbox
label), or the attachment will not be sent.
To delete a video
1 While viewing an album, press Menu twice.
2 Check the videos or pictures to delete.
3 Touch Delete.
4 Touch Confirm Delete.