The attachment has become loose.

His attachment to me is a bit creepy.

An attachment can be two things. One kind of attachment is something that can be added to a device, for instance a vacuum attachment tube. Attachment can also mean a special connection, as in "He had an attachment to his favorite horse".

You can read an attachment by left clicking on the attachment, or right clicking on the attachment and left clicking on "Open".

The plural of attachment is attachments.

No.