Can I copy Battlefield 4 files to Steam Library?

Finally after trying so many times I've got it working.

How I Did It Wrong:

I posted this question here after trying several times and failing and this is how. I initiated the install in steam, it started downloading. A folder was created for BF4 in my steam library like this: D:SteamLibrarysteamappscommonBattlefield 4 . Then I exit the steam and copied my installed files in the above folder. And then I reopened the steam and it started downloading the game where it did leave it before exiting, from 10 MBs.

I did the above step a couple of times and failed each time in letting steam recognize my game files, then I thought that steam doesn't actually download the games into their folders directly but it downloads them to a separate folder as this: D:SteamLibrarysteamappsdownloading, so third time I copied my installed game files in this folder instead and yet it was same result, no recognition of game files by steam.

How It Should Be Done Correctly:

This is how I made it work for me and I'm sure it will work for anyone and any game.

1. Open steam
2. Initiate the download (it will create the folder in steam library as this D:SteamLibrarysteamappscommonBattlefield 4
3. Pause the downloading
4. Uninstall the game from steam, yes uninstall, it will remove the files from D:SteamLibrarysteamappsdownloading and will not delete the folder it created for the game in D:SteamLibrarysteamappscommon.
5. Exit the steam
6. Copy your installed game files to the steam library folder.
7. Open steam
8. Initiate the download again
9. This time steam will start discovering the game files instead of downloading.
10. The above step will only take few minutes and you will be all good to go.

as my game was up to date so steam only downloaded a few MBs and that's it. I hope it helps anyone who's reading this.