Missing Email Templates when using the New Lightning Experience.
|Knowledge Article Number||000230915|
|Description||The new Lightning Experienced introduced a new way to create and manage your Email Templates. Email Templates are now created and managed from the Email tab on the account, contact, lead and opportunity records in the new Lightning Experience UI. Users are able to insert merge fields (1) and Load and Save Email templates (2) from within the new Lightning Experience Email Author.
IMPORTANT: Templates created via the Setup menu in Salesforce Classic are not currently available in the New Lightning Experience. This also applies for Email Templates created in the Lightning Experience: they are not available in Salesforce Classic.