I like the preview function. The idea is to get a fast look at the file without having to download and open. I think it would be more effective if you didn't have to click the pull down, then click more, then click preview. I know, it really doesn't take that much time, but most of my team didn't even know it was an option because they never clicked the "more". I think a little eyeball icon to the left of the file name for quick access would make the function more useful and valuable.
Also, I would vertically tile the file option pull down menu and list all options instead of the current horizontal pull down where you have to click "more" to get the additional options. It is all about speed and intuitiveness. People should know how to use the functions the first time the log on... It should be a pleasant surprise how easy it is to use each function and how obvious it is to find the button. Most of Egnyte's new look conforms to this, but I think the options menue could use a little simplifying. Perhaps even putting the work "Options" next to the pull down would draw the new user's eye.