For a group container, you have to supply the full file path, along with the bundle name.
For example
$ defaults read /Users/<name>/Library/Group\ Containers/<groupID>.group.com.<appname>/Library/Preferences/<groupID>.group.com.<appname>.plist
csytsma
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@Elia314 Did you get this working? Feel free to shoot me an email at "sij" + "itsma" at gmail. I worked through all this and got it working.
I notice that Google Drive uses NSFileProviderCustomAction in some of their helper scripts, and wondering if this is another way to add contextual menus to files/folders in the Finder? Their contextual menus don't seem to be affected like Dropbox's do, which uses FinderSync.
I can't find any examples of how to use the NSFileProviderCustomAction approach. Is this a red herring, or is it another way to add contextual menus in the Finder? Any sample code to use to get started?