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 One ZG5 Hard Drive Replacement - iFixit Repair Guide
Acer Aspire One KAV10 - 240 GB SSD SATA Hard Drive | eBay
16GB SSD ZIF HDD Drive P-SSD1800, GA5N5000018-0J0004 Acer Aspire One A110 Series SSD CE/ZIF. PcHub.com - Laptop parts , Laptop spares , Server parts & Automation