How to install app onto sd card with root (Samsung)?

SM-A520F | Android 7
What I've tried:
I partitioned the sd card using minitool partition wizard. I partitioned it into 100gb fat32/exfat and 20gb ext4 partition. I was able to install apps onto the ext4 partition and read things from the fat partition. However, there was a couple problems. I could never see the ext4 partition, all I saw was the internal storage (32gb) and the sd card fat partition (100gb) so I didn't know anything about the sd card ext4 partition.
Secondly, on reboot the...

How to install app onto sd card with root (Samsung)?

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