Hi,

mine experience was same. Put SD to usb reader. If You have luck sd will be in other format than printer uses and files will be on it. Or You will be like me and SD will be in a  format other than fat32 and will be empty.

Interesting - my microSD worked fine in my Kywoo but my laptop said there were "errors".  I let my laptop fix the errors.  Now it works in both.

But I notice that the Kywoo is not able to read long filenames.  Seems to have a 20 character limit, so your gcode filenames need to be short. Also seems to be a limit on how many filenames it can read in a folder, so you can't have very many gcode files in any one folder.

I would start using the FB page for help it's much faster

There are 2532 members here.  Not many have replied.  Setting up a FB page will probably get the same result.