you can just reattach it thru sequencer - the drop down to the right of the name
things are always breaking the link in Unreal -
If it is a spawnable camera - It shows this in Sequencer as told above but also as a check box under name in sequencer - you can also right click and convert to possesable // this can be set in the preferences so you always get possesables in the Sequencer prefs - if you rename then make it possesable it will rename the one in the world outliner most of the time -