There is a refresh option when adding data. The tool is the circle-like icon on upper right of the Add Data window. See the below screencapture with arrow on right.
However I did notice that refresh option does not work if you choose to browse to a folder using the default project folders when browsing (I put a X here in the below image).You have experienced the same thing it seems. Best to browse using "Computer" browse option below. This does refresh the folders and updates it to show latest files and folders. No need to restart Pro this way.