When you create a new document or if you use File->Make a copy, the document is most likely in your main “My Drive” in Google Drive. If you are having trouble locating your file, here are some tricks.
Click on “Recent” on the left-hand side and single click on a recently edited file. If the file is shared with you, but not already in one of your folders, the toolbar has an icon to add the file to your “My Drive.” You will have the option to determine which folder you want to add that file to.
I am in the habit of going to “Recent” in Google Drive and clicking on the magnifying glass icon to locate where my files are saved.
Toggling the icon (or just pressing the i key on your keyboard) opens up a side panel with information about your document. Part of the info panel (under the “Details” tab) is the location of the file. The folders that the document resides in are listed. These folders are also hot links. Click on the folder name to jump to that folder in Google Drive. Notice that next to each folder is an “X” to remove the file from that folder.
Shared With Me
On the left-hand side of Google Drive is an option for files that are shared with you. This is also a FILTER, not a folder. You can locate files that people have shared with you, by clicking on “Shared with me.” If you are struggling with finding a file, this is a good place to look. The toolbar and info pane for the “Shared with me” filter works the same as the above “Recent” filter.
Z and Shift Z
You can MOVE a file that you recently created or was shared with you by single clicking on the file in Google Drive and pressing the Z key. You can ADD the file to ADDITIONAL folders by holding down the Shift key and pressing Z.