Uploading File to custom directory

You cannot $data['clientid'] or anything like this. Files are uploaded before the record is created so on the Add page we won't know what field hold which value.
Please refer to the documentation that explains what you can use there:

https://xlinesoft.com/phprunner/docs/edit_as_settings_file_image.htm

That totally makes sense. I guess I was thinking in the edit section when the clientid is already created.

This can be done. You can use an event like ProcessRecordValues of the Edit page to save clientid to some session variable and then use this session variable in the custom folder expression.

Wonderful thank you. I should have started in the edit section first.