The function Combine Files from Acrobat Pro DC on Mac has a serious bug. When I've combined files and decided to close the PDF combined without saving it, the files used for it were deleted from my computer! And they didn't even go to my Trash on Mac.

If I wouldn't have OneDrive they would be lost forever, but the OneDrive Trash folder saved them.

I make this report just to let the development team know if they don't know that yet.