I would second @nsattler.
There is a line for security, it is up to you and your district to determine where that line is. These should be serious conversations about possible impact to the district vs convenience of employees. These should also drive employee expectations.
We have had concerns about documents stored at home with Google Drive, etc. This is on the radar for us but we have not yet done anything with this. In all honesty, this is far down on my list of cybersecurity concerns (although it is definitely on the list).
There was an issue years ago (not my district) where a counselor had student information in their downloads folder on a personal laptop that was lost/compromised.
IF I were to approach this, I would be using our MFA/Identify vendor to verify the machine prior to logon. That's not the low hanging fruit I'm currently working on though...