First, can you confirm that this template file is the correct one for the URL you are viewing?
You can test by simply adding this to the file: <h1>Hello World</h1>
Secondly, your code contains an incorrect syntax for the the_field function. Please read over the docs for both functions used to see that they both accept a string parameter of the field_name, not a value. <p><?php the_field( $snippet ); ?></p> should be <p><?php the_field( "snippet" ); ?></p>
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