If there's an arrow on the new filter that says "UP" next to the arrow then it's not an air flow arrow. It's simply an "UP" arrow telling us which side goes up because all horizontally mounted cabin air filters with the blower motor mounted below the filter will have downward air flow including Toyotas. This is easy to figure out because if dirty air was flowing from the bottom to the top then all that crud you found on the topside of your old filter would have been trapped under the filter and inside the blower motor. Sonic it says up next to the arrows then point it up but if it doesn't say up then point the arrows down in the direction of the air flow.
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If there's an arrow on the new filter that says "UP" next to the arrow then it's not an air flow arrow. It's simply an "UP" arrow telling us which side goes up because all horizontally mounted cabin air filters with the blower motor mounted below the filter will have downward air flow including Toyotas. This is easy to figure out because if dirty air was flowing from the bottom to the top then all that crud you found on the topside of your old filter would have been trapped under the filter and inside the blower motor. Sonic it says up next to the arrows then point it up but if it doesn't say up then point the arrows down in the direction of the air flow.