Repeating here, as well as emphasizing.
I think those who have recommended potting this Paph in something other than sphagnum may have missed the point that it is rootless. The best chance of getting roots before the plant succumbs completely is in high humidity with moist (but never soggy) sphagnum around the base of the plant. Keep the plant immobilized so it doesn't flop around at all, and replace with fresh sphagnum every few months. Live sphagnum is even better.
A more typical bark based potting mix is not as good for promoting roots when a plant has none. There is leca for drainage below the sphagnum and in a clear container it is easy to observe any standing water and correct it. Assuming careful observation of a plant that needs TLC, it is in essentially ideal conditions.
Do not omit fertilizer completely. It won't absorb much, but dilute fertilizer solution on the leaves and in contact with the base of the plant is the only source at all. It will absorb some. A root promoting product like KelpMax is also appropriate.
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