Thank you for your inquiry. I am not quite sure if I understand your question correctly. This is only about editing in Word, everything else works. The fields must be edited in the field code. The umlauts and spaces should be replaced, just like you would do it by hand. Only the image name between the quotation marks should be changed in the field. Nothing should change in the field itself. So e.g. as follows:

Maybe you can help me, that would be great.

Kind regards - Lothar