Windows Phone 8.1 and SD Card Storage?

[TrophyNostalgia]

A couple of days ago I upgraded to an LG G4 (running Android 5.1) [Please don't crucify me, I'm only exploring everything out there and am aiming to return to Windows Phone a bit into the Windows 10 Mobile cycle in late fall :sweaty:]. I'm looking to transfer everything that's on my SD card to my new Android phone from my old HTC One (M8) for Windows. How does Windows Phone 8.1 store things on the SD card? I had everything possible on my HTC One (M8) for Windows stored on the SD card. I believe that included applications, maps, and more. On my LG G4 I only want to transfer music and photos. Do I need to delete all applications/maps for Windows Phone off of the SD card before I pop it into my LG G4? I don't want there to be a chunk of space that's inaccessible because of Windows Phone files that can't be used on Android. If anyone could advise me as to the best course of action, I would be grateful!