Sketch Text Property Link Question

Hi, I'm using SW 2021. I have a part with a global variable that adds values to get the total length of a sweep path. This evaluates just fine. I then have a custom file property that takes its value from the global variable. It also shows a valid evaluated value. Then I have a sketch whose only purpose is to hold a text feature that links to the custom file property and displays the numerical value. In creating the sketch text, I use the "Link to Property" button and select the custom property. The sketch text displays the expression from the custom property, with the quotation marks removed, instead of the evaluated value. I believe I had it working initially but then it stopped evaluating it. No amount of rebuilding, editing, redoing, etc. seems to make a difference. Why is that? How can I get the sketch text to display the evaluated value?