Folder
data class FolderPickResult(val success: Boolean, val path: String, val documents: List<DocumentHandle>, val token: String, val displayName: String, val error: String?)
uapmd::FolderPickResult. On success exactly one of path (desktop) and documents (Android, iOS, web) is populated; both empty means the user cancelled. Each document's display name is its path relative to the folder. token names the folder again for DocumentProvider.listFolderDocuments, and is empty where a folder cannot be returned to (the web).