I have an Alocasia, from pictures online I think it's an Odora. It puts out a new leaf around every month or so and the new(er) leaves are always fine but as they age they get brown bits on the outsides which gradually get worse and so I end up cutting the leaf off. I'm wondering if it's scorch marks from the intensity of the sun? It was purchased as an outdoor plant but I have it indoors in a window which gets about 2 hours of direct sun in the morning. I've heard that direct sun through a window is more intense than outdoors so maybe that's it? If not....what else could it be? I use a humidifier to keep up the humidity, I water regularly and fertilize with Osmocote Plus every 6 months or so.