I would like this feature also. Vivomove 3. The floors are never correct. Some days, it has me going up several floors, but not descending and other days, I descend several floors without ever going up. I had floors logged a couple times when I didn't take any stairs and other days I have walked several flights and it shows nothing. Not accurate at all.
If you use the Floor Climb activity, you can adjust the number of floors climbed by editing the activity. It won't change the automatically detected daily count, though.
Some tips to get the counting more accurate are posted in this thread: [What's the secret to tracking stairs accurately?]
Some of the same tips are included also in the offcial document: [My Floors Climbed credit is not accurate. What can I do?]