Does the Drive root delta API always return file download information for changed files?

I’m using the Microsoft Graph API delta query on the root folder: GET /me/drive/root/delta I want to clarify the behavior of file download information in delta responses: 1. Will information needed to download files always be included for changed files? 2. Are there cases where it might be missing even if the file has changed? 3. For a reliable incremental sync, is it recommended to request fresh file download information via a separate GET for each file instead of relying on the delta response? Thanks for guidance.