First, welcome -
When you mounted it, did you place it so that the new roots/new growth were toward the mount? If not, they'll head off into the air.
It does come from the hot, humid lowlands of Papua-New Guinea. If you did the mounting and it's not attached at all, you could just remove the ties and pot it up. If it has some roots attached to the mount, you could pop the whole thing into a pot and fill in with bark. It probably will be happier in a pot - maintaining a high-humidity mounted plant outside of a greenhouse means watering several times a day which is difficult to maintain. .
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