You don't need the configuration/descriptor file if you're executing a 2of2 or 3of3.
You just recover the multisig wallet as you would a singlesig, by just uploading the keys to nunchuck or bluewalle...
Dude you need to read about how multi sig works. In 2-2 multi sig, you still need the xpub. Know the sequence of how you created the multi sig at first. After that which derivative pathway it used. Let’s say you used sparrow to create your multi sig but didn’t saved your xpub, now after 10 year sparrow wallet isn’t there any more, how will you construct your multi sig if the new wallet doesn’t use the same derivative pathway that sparrow used?
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