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.
Acer Aspire V3-771G Hard Drive Replacement - iFixit Repair Guide
How to Change Your M.2 SSD for Acer Aspire E5-576 : 4 Steps - Instructables