Mr. Ehresman has put together a "HOW TO" of methods for submitting assignments through Canvas if Google isn't working. We are using several work-around alternatives to submitting assignments directly from student Google Drives. If your student is having submission issues, particularly on assignments they are trying to submit from home, feel free to use any of these methods. You may also wish to let your student's teacher know about the issue by email.
This guide includes some videos to show you what the Canvas and Google screens would look like when you go through this process.