You will get an error if Flash Fill cannot find the pattern. The first thing to check is that you're using Flash Fill close to the source data (e.g., in the adjacent cell). For instance, it won't work ...
As an Excel pro, I could use the old Excel 2003 menus with my eyes closed. I knew where commands were located. I knew the Alt shortcut keys for the commands that I used frequently. Alt+E+S+V was Edit, ...
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