Spots on an older leaf are normal. The plant was grown in high humidity/low light; that leaf shows transition stress. As long as new growth is healthy, the plant is fine. All leaves will acclimate over time.
Humidifiers rarely raise humidity significantly unless the room is sealed. Better: pebble tray with water (pot on pebbles, water below pebble tops). Misting only works for minutes—impractical. Let the plant acclimate to lower humidity; keep soil moist.
Good growing!
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