Prime 4 issue

Hi all, i have an issue and wondered if anybody has any advice.

I normally connect my prime 4 to my phone. Transfer my music to the internal ssd in ky prime 4. I then connect a laptop and move the music from the hardrive (D) into my music etc on the prime 4.

Today ive added the music the hardive shows fine on my phone but when i open up the laptop the hardrive does bot show at all.

Any help would be perfect

Also how do i update the engine on my laptop?