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.
How to Install SSD in Acer Aspire 3 laptop? - SSD Sphere
Fitting an M.2 SSD into the Acer Aspire 3 A315-41's Hidden Slot - YouTube