The FIRST thing you should do with ANY new file (Doc, Slides, Drawings, Google My Maps...) is to give it a NAME.
If not, you end up with sad, lonely files all called UNTITLED which makes them super tricky to find.
Click in the box in the top left ABOVE the menus and TYPE in a name for your file.
TOP TIP:
Use a name that clearly shows what the file is
e.g. Weather Poem or T2 Shape Puzzle