Reddit, I opened up my Acer Aspire One (ES1-132) recently in the hopes of upgrading the 32GB SSD. It turns out the SSD is eMMC so it is soldered to the motherboard.
OFFTEK 8GB Replacement Memory RAM Upgrade for Acer Aspire ES1-331 (eMMc Drive) (DDR3-12800) Laptop Memory at Amazon.com
NX.G18EK.003 - Acer Aspire ES 13 ES1-331-P2RV - 13.3" - Pentium N3700 - 2 GB RAM - 32 GB eMMC - UK - Currys Business