Because it doesn't have roots it isn't really getting any water. A Paph in that condition must be in a terrarium environment, nearly 100% humidity, or it dries out like this. It might not be too late, it is certainly trying, but give it a real chance. Sphagnum is the best choice for now, and seal it inside a clear plastic bag if you don't have something like a covered terrarium. It also needs to be held firmly in place, no flopping around, or new roots will never have a chance. The part that fell off is long dead. It needed to go.
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