After you log into Google Drive, look at the menu on the left. At the bottom you’ll see an option for Owner, Type, More that gives you a variety of options for sorting and searching through all the files your Google Drive account has access to.
When you click on Owner, Type, More, a drop-down menu will appear below the search box. Don’t put anything in the search box. Instead, select Owned by Me to see all your own files. Or choose whatever other option is appropriate for your needs.
Still can’t find your file? Try clicking on the link to Trash. You’ll probably be surprised by what you find in there 🙂