I hope someone who has already created folders/collections in version 2.5 will chime in and let me know if everything remained intact after sending a book to his Kindle with version 0.7.0 or later.
And I apologize if I am coming across as a Luddite. (It's not that I'm lazy, I just like the way I have things set up is all.
)
EDITED TO ADD:
I guess if no other option is enabled or available the alternative will be to save the file to the desktop and load into Kindle's folder manually but I hope there will be a more elegant solution.