Storage Issue?

Hey guys not sure if anybody else has run into this yet, I have a RP2 with android 9 and I've been collecting great games to play left and right, plus I have a ton of music downloaded locally, I take pictures, videos, etc... pretty soon 64 gigs goes fast, right? "No problem" I tell myself, as I shut the phone down, pop out the tray, toss in a good sandisk 128 GB micro SD card and fire it back up. It recognizes the card right away and says "hey, you wanna use this for phone storage? you could free up a lot of space!" and I'm like "heck yeah thats exactly what we're trying to do here!" So... the data migration window gives you no options and no insight as to what its moving to the card, but it does its thing. It "migrates data" for like 10-15 minutes or however long, and when it finishes it now shows 34 GB of my microSD card is used, and 54 GB still used on the internal storage.... wat? I don't understand. Nothing was "freed up" on internal, but it copied "something" to the SD card. Clearly it duplicated something but did no cleanup on the actual phone storage. I tried restarting the phone, still shows the same. 34 gigs used on the card, 54 used on internal just like how I started before I put a card in. What the heck? I know this is probably more an android 9 issue than a RP issue, but thinking maybe someone else here has ran into this and has some ideas? The RP file explorer won't show me whats on the card so I'm gonna have to find some other way to see what was copied, but even then it will be hard to tell whats safe to delete because what if the apps are still using the version of the data on internal storage? Pain in the butt, seems like this should work properly. Going to be peeved if there is no way to fix it other than factory resetting the phone and starting out with the memcard from the get-go.