I know why you are still getting water
inside the building.
Looking at the siding, I can see that you have a problem and it may be the reason why the ceiling is leaking when it rains. Not all leaks are caused by a faulty roof, look at the big picture of the problem area.
Over time siding can go bad and fall apart. This may be due to improper flashing, or paint preparation. If it is left uncorrected, it can lead to bigger problems. If water penetrates and getting inside the wall, it can appear to be a roof leak.
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