So, AWS encourages the use of Layers (zip files containing dependencies) for Python lambdas. The size limit for a Layer is 69 MB. But the size limit for a lambda is 250 MB.
I did all of this stuff to shave an AWS Layer down to size, and the lambda still can't find the libs I put in it (and it's probably my mistake). I could try to figure this out.
Or! I could just shove everything into the lambda itself, which they seem to not want you to do?