FFileName - Cannot access private symbol


I have some local files which I need to save each day.
I need to set to each file which DropBox folder I should copy them.

I tried this approach:

ci := TTMSFMXCloudItem(TTMSFMXCloudTreeViewItem(TreeView.Selected).DataObject);
FieldByName('cloud_dir').AsString := ci.FFileName ;

The problem is I got this error message:
"Cannot access private symbol TTMSFMXCloudItem.FFileName"

How can avoid this? Is there a better approach?

Thank you.

Please use the public property accessor:

ci.FileName: string;

Thank you very much!