Finder Integration on Mac doesn't seem to work or get enabled?
Dropbox disappeared from my finder on an iMac running OSX 10.12.6. The "Enable Finder Intergration" is checked in the preferences. I re-downloaded the Dropbox app and restarted, but it still does not appear in my finder window.
Honestly, this might sound a bit condescending but I don't mean it to be -- if I am understanding you correctly on what is happening, are you sure you are looking in the right place for the folder? On my computer I have it set up so that if I go to the Users page in finder and click on my name, I see a "Dropbox" folder between Downloads and Library. Search for the Dropbox folder in finder, but check the option to search "this Mac" to see everything. If it means anything, I am running OS X 10.12.3 so it should be similar for us.