Thanks for replying.
When I last posted I had not read thru the entire thread (shame on me). Now that I've done that I understand that it must be a dynamic block, and the insert must be modified dynamically for the field to display the attribute's value. I also understand that the two situations are not actually analogous in any case. The OP and I were hoping to get an attribute's value to show up in a field, whereas in your case, I think the attribute contained a field that was linked to another attribute value or a field. For the OP's purposes, I don't think that arrangement would work because the field must be "inserted" into the middle of the MText so that the text will expand/contract based on the number of characters in the attribute value. I can't think of another way to accomplish this.
I suspect that it does not actually work for the OP. But if it does, I hope to see an example (soon).