The `Assets` folder only exists in the editor. It's not good idea to write to this location, since it'll fail in your final game build. Also, not all platforms allow you to write files.
Unity doesn't expect the game to write files into `Assets`. Alt-tabbing to Chrome and back tells Unity to check for new files. (Think about it this way, you *might* have alt-tabs to file manager and copied files around. When you alt-tab back to Unity, Unity looks for changes.)
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