Make symbol from multiple existing copies of the same elements
It would be helpful if we could make a new symbol from multiples of the same object - for instance, you've got a button or icon that is exactly the same, but you've got 10 of them in use already. It would be great if you could 'symbol-ize' one of them and have it work on all instances.
Chris Cannon commented
Make Symbols with the same layer name retroactive when you create a symbol later in your project.