Beginner Gardening: Schefflera has brown spots on leaves, 0 by Midi

Midi wrote:
I bought this plant about 2 weeks ago and changed the whole soil. We have very low humidity in our house and I have tried to use spray bottle and container that includes water near the plant, but none of these gives any help.

Does the new soil stress the plant or the low humidity? Or overwatering/underwatering/root system is broken after the soil is changed? This problem is getting worse all the time, please help me!


PS. When the leaves start to get those brown spots they drop very easy after touching them.