1. Who can edit documents?
Team Membership provides full access to all content within the Team, including all Channel Content.
2. Are there audit logs that will show who edited a document and when?
Microsoft does provide Audit logging of certain actions and functions to accounts or documents. However, there may not be a specific detail about every change or setting made to document or Team. We can provide any detail that Microsoft has within the Audit Logs of Office 365.
3. Is it preferable to share files on SharePoint or Team OneDrive?
SharePoint and OneDrive are one and the same for the team. SharePoint is the web access process to provide a URL to OneDrive, which is where the documents are stored. To simply state it, all documents stored in SharePoint use OneDrive as the storage platform.