Gina1960 said: Well, its a small plant with one root and one leaf. And it looks like you have placed it in a very large container with a whole lot of substrate. Going into soil when a plant has a great single root is certainly a fine idea. But the first rule of plant propagation has always been....only pot a cutting into a pot **just big enough** to hold whatever root mass it has. That way, the plant can safely get established without the danger of drowning. The soil in a much smaller container will drain a lot more quickly. All the extra soil in your container will stay wet a lot longer and increase the chance for rot.
The other thing is, patience. Monstera albo can be very slow to establish. The fact that the seller was generous enough to actually give you a viable root is a plus. Many people receive butchered cuttings with all the roots removed.
I might not have said 'straight into soil'. I would have probably said, into damp sphagnum moss first, get a great root system, then more to soil.