I tried, to be certain, but unhappily it doesnt' work either... Some mods I put in the MyMods folder are showing in StudioNeo with no trouble."Mymods"? I think they are supposed to go inside of <game_root>/mods/
Eg., after dowloading this small mod from Hooh ("Niche mod") :
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, I tried putting it in the Mymods folder, the mods folder and even in the SideLoader folder, checking each time if it is correctly activated by KK, with no luck in the end Btw, using the "Install mod..." tool in KKManager failed too. A great mystery...