/demos/collection/multitable.php and /demos/collection/crud.php (bottom right CRUD) demos shows zero records:

maybe this happends only when reimported, not sure, insvestigate locally, https://ui.agiletoolkit.org/demos/ is not up-too-date to check there

I have checked and there are records in the DB, but the following condition:

$file->addCondition($file->fieldName()->parent_folder_id, null);

filter out all of them...