Can I plot S21 and S12 from .s1p data?

In a first set of measurements from my VNA (vector network analyser), I was able to collect .s2p files which I could plot the S-parameters from. In a later set of measurements, I somehow only had the option to save the files as either .s1p. Can I not gain the S21 and s12 plots from these? Matlab won't let me import the data either, is this something that Matlab is not designed to do or am I doing something wrong?

[Walter Roberson]

sparameters can read s1p files https://www.mathworks.com/help/rf/ref/sparameters.html#bup5ppl-1-filename that conform to Touchstone 1.1 and 2.0 standards (starting from R2023b)

Also of potential interest:

https://www.mathworks.com/matlabcentral/fileexchange/68893-s-parameter-utilities