It boggles my mind that things as, I should hope, "simple" or at least "well researched" as freaking open-file type dialog UX's are often still super utter excrementally poopy. For example, Linux GUIs are very often super barfy in that respect in my experience. IntelliJ's GUI is also - I just re-rediscovered - a big pile of dookie as well. It seems to let me ctrl-click to select more than one file to include, but then... it actually only included the first one in the set when all was said and done. With no real feedback on that other than that I had to manually personally notice that only the first one was added. So, like, that's just great. Yeah.