Get contents of a shared folder

Thanks for the help. I included the code for the call and the resulting response below. The "subfolder" contains a file, but that file doesn't appear in the entries. When I make the same call to the "superfolder", it does include any files in the folder. 

I thought the difference was that the subfolder is shared, but maybe it's related to something else? 

Also, the "has_more" value is true, but I'm not sure how to call back again -- do I change one of the parameters or just make the same call right away?

Last note -- I'm setting the cursor to null, because I'm not yet tracking the cursor. 

CALL
$cursor = null;
$pathPrefix = '/superfoldername/somesubfoldername';
$result = Dropbox::getDelta($cursor, $pathPrefix);

RESULT
array(4) {
["has_more"]=> bool(true)
["cursor"]=> string(302) "somecursorstring"
["entries"]=> array(1) {
[0]=> array(2) {
[0]=> string(49) "/superfoldername/somesubfoldername"
[1]=> array(13) {
["rev"]=> string(10) "2047cde5ef"
["thumb_exists"]=> bool(false)
["path"]=> string(49) "/superfoldername/somesubfoldername"
["is_dir"]=> bool(true)
["icon"]=> string(11) "folder_user"
["read_only"]=> bool(false)
["modifier"]=> NULL
["bytes"]=> int(0)
["modified"]=> string(31) "Sun, 01 May 2016 16:38:32 +0000"
["shared_folder"]=> array(2) {
["shared_folder_id"]=> string(10) "1205541233"
["is_team_only_shared_folder"]=> bool(false) }
["size"]=> string(7) "0 bytes"
["root"]=> string(7) "dropbox"
["revision"]=> int(32)
}
}
}
["reset"]=> bool(true)
}