Storage can indeed be expanded using a micro SD card - I've got a 128gb card installed in my tablet. Ditto external USB drives. Works fine for all my personal files.

However even though your micro SD card is installed in a specific slot on the tablet it is nevertheless considered to be external storage.

And because it is external storage Windows will not use it to expand the 32gb primary storage device, nor will it se it for any temporary file storage mid-update. You are still stuck with that limit.

Believe me I've tried.....