Despite the comments, you can allow anonymous users upload to your Google Drive account via your app.
One time only, you need to authenticate as yourself and then authorise your app to access your drive account using offline access. This will create a refresh token. Store that refresh token somewhere in your server. You can do this by writing some code that will only execute once, or you can use the Oauth2 Playground.
Then subsequently, an anonymous user can upload a file to your app, and then your app can upload that file to your Google Drive using the stored refresh token to request an access token.
An alternative (and possibly better) approach is to use a Service Account.