Hopefully you have been reading my posts about the new Google Drive. I'm up to Tip #5. Today's Tip #5 asks, Where's my shared folder? In the old Google Drive, you could see the "Shared" folder on the left side.
In the new Google Drive, all files "shared" with you can now be found in the Incoming View.
To move the "shared" files to your drive, select the file you want to move to your drive and click Add to My Drive.