Mount iso/udf image?

I’m trying to mount .iso images but I get this error
“Filesystem type udf not configured in kernel”

I added boot.supportedFilesystems = [ "udf" ]; but nothing works

Did I forget something?

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I don’t have udf added explicitly, yet I have the udf kernel module.

To see which filesystem kernel modules you have, take a look at /run/current-system/kernel-modules/lib/modules/*/kernel/fs/

Indeed, I just checked and I have udf.
udisksctl loop-setup -f foo.iso works.
but thunar or pcmanfm gives me this error with the kernel

I fixed the problem by adding

boot.initrd = {
    kernelModules=["amdgpu" "udf" ];