The mini.iso will work. I can't recall if you need to edit the boot menu or if it gets the paths correct automatically.
https://pkgmaster.devuan.org/devuan/dis … s/netboot/
https://pkgmaster.devuan.org/devuan/dis … s/netboot/

Names might be different from what refracta2usb expects. 'vmlinuz' might be 'linux' and 'initrd.img' is probably 'initrd.gz'.

Ask if you have more questions.

How do I make it work with devuan netinstall? While I'm using refracta2usb it prompts me to some files I can't find inside the iso file. Is it necessary to be a live-version?

You can create multiple partitions on the usb stick.
First partition must be fat32 and will hold live-isos or unpacked live-isos.
Additional partitions can be used for persistence or to hold loopback files for persistence.
Persistence volumes can be encypted if you want.
If you really want to only have one partition, you can have that with loopback files for persistence on the same volume.
More...

Ask if you have more questions.

They have a persistence plugin which is what you are looking for to store data files.

https://www.ventoy.net/en/index.html

https://www.ventoy.net/en/plugin_persistence.html

edit: ventoy is ok, but follow fsmithreds advice in post below. Might try this myself.

I am trying to create a Multiboot USB that also has a standard partition to store data (files, documents, etc.). I followed the instructions in the Arch wiki to do it using GRUB but I have no success, if someone could guide me on how to do it.

Thank you.