Can I import my existing documents/PDFs into the Co-Writer?

Yes, you can. When you create a new project, click on the “Upload Doc” button within the editor. You can then choose the document you wish to import

Additionally, you may import documents contained in your Google Drive into Co-Writer. Quillbot's use and transfer to any other app of information received from Google APIs will adhere to the Google API Services User Data Policy, including the Limited Use requirements.