Well the Puppy Linux is not new, AFAIR first version was created on 2013 or even before, but I haven't seen new versions for a long time, at least since 2017 or 2018.
The menu entries with pmedia=xxxflash, ended with flash load automatically and expand on Ram the files with extension .sfs mentioned on my previous post, and all is ran in Ram, untill you close the OS and then you are asked the first time if you want to create a persistence file, and following times you close the OS it asks you if you want to save the changes or not.
JFYI I'm writing this from Puppy Linux slacko x64 v7.0 booted this time by means of Ventoy, for testing purposes.
alacran