Did you convert a .tap file to .wav or did you find the image already in .wav format Anna?
I actually only tested saving and loading via the builtin BASIC, nice to see it works for already existing images too
Very easy. I used Tape2WAV v1.8 vor Windows to convert .tap file to .wav. The conversion for SAM Coupe tap format is missing and the ZX Spectrum conversion for this tap format is not working in/with castool.