I would like to request that a) the "Add Files" portion of the Combine Files tool process files more quickly [e.g. a simple text file can take 40+ seconds to process (show a thumbnail) before it can be converted] and b) that, during that time, the UI notifies of what it is doing [after the "Combine" button is click, a "Converting..." progress bar appears at the bottom; something similar to that at the "Add Files" stage would be helpful)