Currently our users are using Email to Salesforce and we are slowly moving teams to Lightning and Lightning for Outlook beginning in the next month.

When using Email to Salesforce and there's an email attachment, it is stored as an Attachment and not a File. 

Where I need clarification is can I turn off Email to Salesforce after everyone is moved to LFO so we no longer have Attachments stored (vs Files).    Or is there a setting somewhere if someone uses Email to Salesforce any Attachments will be converted to Files? 

Thanks in advance!