writing FITS files

[denfc]

I can read a FITS file easily, img = AstroImage("file.fits"), and then I just attempt to write it back, either with its original header AstroImages.save(outputFname, img; header = head) or without it AstroImages.save(outputFname, img) (FITS files have to have a header?), which I should be able to do, but I receive errors of the type "FITSIO writer error: neither save nor fileio_save is defined due to FileIO.SpecError(FITSIO, :save)" .

Guided by Copilot, I've also tried to save that img with various combinations of FITSIO directly. It looks like there's a issue with the Julia CFITSIO interface.