When added additional notes they are not saved. They will stay if you don't close the app but if you exit and reload they will be blank. I use them to add supplier and supplier part number. Maybe you can make a field for that.
Using of special chars in component name can cause error of saving datasheet.
Example: *&^*&(^*&^_some_component_name - component datasheet will not be saved \..\..\..\some_component_name - component datasheet will be saved not in data folder