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
Replace SSD on Acer Aspire One ZG5 - David Yin's Blog
Acer Aspire One - Wikipedia
Laptop SSD Upgrade (Aspire One 725) - YouTube
FireSword blog: Upgrade HDD to SSD on Acer Aspire One D270 (AOD270)
How to upgrade Acer Aspire E15 E5-575-33BM Laptop – model E5-575-33BM – Official Website
SSD Upgrade for Acer Aspire Notebook One 756 256GB/512GB/1TB/2TB | eBay
Amazon.com: CMS 256GB SATA3 6GB/s 2.5" Internal SSD Compatible with Acer Aspire One D255-2331 10.1 Netbook - C91 : Electronics