I guess i still haven't understood something about sandboxing or entitlements.

I am trying to access the user's ~/Pictures folder, and also create a 
security-scoped bookmark (SSB) for that folder.

Under the target's Signing & capabilities section, File Access Type, I have set 
"Pictures Folder" to read/write.

Getting the path using this
        NSURL * pic_dir = [ [NSFileManager defaultManager] URLForDirectory: 
NSPicturesDirectory
                                                                  inDomain: 
NSUserDomainMask
                                                         appropriateForURL: nil 
create: NO error: &err];

and doing a spotlight search over the folder works just fine.

However, creating a SSB for pic_dir does not work.

I am trying to create it like this:

        NSData * dir_bookmark = [dir bookmarkDataWithOptions: 
NSURLBookmarkCreationWithSecurityScope
                               includingResourceValuesForKeys: nil
                                                relativeToURL: nil
                                                        error: &systemError];

But I get this error:

Error Domain=NSCocoaErrorDomain Code=256 "Could not open() the item" 
UserInfo={NSURL=file:///Users/zach/Library/Containers/de.zach.ArtSaverApp/Data/Pictures/,
 NSDebugDescription=Could not open() the item}!


All of this is happening under macOS 11.5.2 .

Any insights will be highly appreciated.
G.

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