Jasmine sambac is a sun lover. Place it directly in front of a south-facing window with drapes/blinds open all day. Inadequate light is the most common cause of leaf drop.
To guard against possible bacterial/fungal issues, spray the entire plant (tops and undersides of leaves, soil surface) with plain Lysol spray (generic OK):
Never let the soil go bone dry—even brief drought causes leaf drop. But avoid soggy soil (root rot risk). Water when the top inch feels dry.
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