I bought the full version of Grafio and i cannot see the files from the lite version.

Each app is restricted to it’s folder and Grafio is a separate app from Grafio Lite. The only way for now is for you to send email to yourself with the documents you want to transfer between the two apps. The email will contain .idd file (Grafio Document) which you can open with Grafio from your email.

You can also use Dropbox to export from the lite and import in the full version.