Major Description
If you copy/paste or type an absolute path to the save as text input field, the result 'selectedFile' is the concatenation of the selected path and the path in the text input.
So you may end up with a File object pointing to something like : "C:\toto\D:\myotherdirectory\file" which is obviously incorrect.
we can (should) check the result from the dialog but handling this case should, imho, be done by the FileBrowserSheet component.
What do you think ?