There's no better way to ensure authenticity and accuracy than by starting with your own writing as source material. This article describes how to upload writing samples to your account.
Navigate to your Content area.
From your home screen, click the Content option on the left side menu.
Upload files
Click the Upload Source Material button in the upper right portion of the screen and select the files your wish to upload from your computer.
Note: Documents uploaded as source material are locked and uneditable because they are used exclusively as source material for AI.