I don’t think Atmega-based keyboards can show up as usb storage (like an rp2040-based keyboard). You probably need to flash using QMK Toolbox or the command line (after entering bootloader mode again).

Well he wasn’t callrd “Mao Ze Dong” for nothing

Hey Ferb, I know what we’re gonna do today

Although the name sounds like it, “Mycroft” isn’t something developed by Microsoft Just a heads up if I interpreted your comment correctly