When selecting bunch of files, like 200 hundred files, then dragging them to a program, the stage of "Building items list" that we can see on the bottom bar takes some decent time. Which understandable, but after few seconds in this stage the UI freezes, which makes the mouse unusable for other programs after dragging those selected files.
suggestion fix:
adding an option to the "File" or "Edit" menu to "Build items list".
This way one can select files, press "Build items list", and when it is ready to use, you can then drag the files to another program.
Also this way the UI will never be frozen, the mouse will be always usable, and drag and drop will be always usable.