When I am notified of an edit in a dossier, how do I know what the edit was? Is there a way to drill into that?

When you are notified about a change in a Dossier, e.g. the Indonesian Food Regulatory Guide, you can have a summary of the changes by accessing the comments sections on the right panel as per the screenshot.

 

If you will create your own dossiers, every time you release a new version, the system will ask you to enter comments about the changes, so you'll be able to track those changes too if you'll need to do so, else you can disable the commenting function.