No worries. Sorry that I missed your earlier question regarding make and model. I used a Transcend 256Gb M.2 2242 SSD drive, model TS256GMTS400. I think it's an older model, but I was able to get it for a very good price locally. I cloned Windows 10 from the inbuilt 64Gb eMMC drive to the new SSD using the instructions here: https://techtablets.com/forum/to ... to-a-256gb-m-2-ssd/
It's working very well an is much faster than the inbuilt drive.
Thanks Gajack. I checked that link and the drive, including shipping, would cost 85 euros. The same drive on Amazon.it (the store of my country) costs 91 euro. I'll go on looking for something cheaper.