Glad to hear that you like the features in Recruitment.
Uploading CVs manually or bulk upload won't activate email sending, please don't worry. Instead, there are only 3 hiring stages that candidates will receive email notifications via Grove. The stages are: Applied via Grove career site, Offered, and Rejected.
When moving a candidate, for example from the 2nd interview to Offered, a popup window will appear and ask if you want to send an email. You can also customize or edit the email's content at this stage.
In Recruitment Setting > Email templates, there are already sample emails for the stages that were mentioned. You can simply click on an email template to edit or create your own by clicking on + New Template.
Hope this helps!