No, the issue is that the customer cannot use the local Google Drive client. It's right there in the opening: "Google Drive started crashing regularly on PC".

No, the issue is that the customer cannot use the local Google Drive client. It's right there in the opening: "Google Drive started crashing regularly on PC". Gmail's default behavior, as anyone who's used it is familiar with, is to automatically upload attachments in excess of a specific filesize to the user's Google Drive account. The user has no control over this.