I tested a few times, and found that if the unit is wrong, meaning the displayed wavelength range is not the same as the data, it will not show the raw data, which is reasonable. This is why I suggest to have entended view. Whe you import the data, make sure choosing the correct wavelength/frequency unit which matchs with the data.
Please try the example file oline: https://optics.ansys.com/hc/en-us/articles/360034915093-Creating-new-sampled-data-materials-in-FDTD
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