I just a typed this piece of diaglogue in Scrivener 3.0.2 (1504)
“Certainly.”, she replied cheerfully and vanished.
Scrivener is auto-correcting/auto-captializing (not sure which) 'She' as shown below.
“Certainly.” She replied cheerfully and vanished.
I'm not sure if this is a bug or a option that I don't understand. Is there a way of fixing this issue relative to dialog that doesn't involved turning off auto-correct globally?
UPDATE: based on answers, if remove the erroneous comma, when I type:
“Certainly.” she replied cheerfully and vanished.
Scrivener still auto corrects to
“Certainly.” She replied cheerfully and vanished.
However, per the answer about using comma's within quotes, if I type:
“Certainly,” she replied cheerfully and vanished.
Scrivener doesn't correct anything. This seems to be inline with the American style of dialogue described below.