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.
Amazon.com: CMS 256GB SATA3 6GB/s 2.5" Internal SSD Compatible with Acer Aspire One D255-2331 10.1 Netbook - C91 : Electronics
Upgrading the Acer Aspire One 722 to 8GB | Delightly Linux