AB,
Just try using the definition of soul as "that which perceives meaning", and you should find that we do not just react, as animals do, to whatever our sensory data perceives, but we also attach meaning to it.
First, “that which perceives meaning” is called consciousness. There’s no need to invent something else to do the job for which you have neither logic nor evidence. What you did was equivalent to asserting “there must be leprechauns because we have rainbows”.
Doesn’t work does it?
Second, you have no grounds at all just to assert that “animals” “just react”. To the contrary, there’s overwhelming evidence that other species emote, plan, defer reward, co-operate, grieve, use tools do all sorts of things you imagine only our species does.
Third, given that for example some great apes have been taught to use sign language and have initiated complex meanings of their own, your “meaning” point is about as robust as your assertion “soul”.
Just try thinking of what we experience as "meaning" without describing it in terms of a physical reaction.
Just try thinking.