Did Arthur Conan Doyle say “You see, but you do not observe”?

Did Arthur Conan Doyle say “You see, but you do not observe”?

Found word for word. Yes. The text appears in works attributed to Arthur Conan Doyle. Source and location below.

"Quite so," he answered, lighting a cigarette, and throwing himself down into an armchair. "You see, but you do not observe. The distinction is clear. For example, you have frequently seen the steps which lead up from the hall to this room."
The Adventures of Sherlock Holmes — Arthur Conan Doyle, ¶21 · Public domain (US), Project Gutenberg #1661 · source

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