Hi Mark,
See attached, when I go to upload a file in Files, if the file contains parentheses, the Upload File dialog will display them as underscores.
The file does get uploaded correctly with the parentheses and displays so, and if you click on Update the Update dialog will display it correctly, it's just the initial selection, either by Drag-n-drop or Browse, it will display the underscores.
Cheers,
Christos