Relion 3.1 file import is working nicely in cryoSPARC 3.1 except for that the rlnImagePixelSize field in the optics data table isn’t used, so particle import doesn’t work unless a pixel size is entered manually. (All the other fields seem to be read now, though).
Thanks for the heads up. We’ll get this fixed!
A fix for this is included in v3.2, released March 29, 2021. Release notes available here: https://cryosparc.com/updates