Yes, using steganography, you must keep the original file. Once you make a copy or share it online it get compressed and altered, the steganography inside is gone.

I post it just as an example so people will dig more into this easy solution. But yes, indeed, you must be careful with the original file and have also copies of that seed in another places, do not rely only on that file.

Imagine having a digital picture frame on your desk, with some nice images with your family. Those could contain each one a wallet seed, for example. And nobody will know it.