So I just found out that the sd card path for side loading tpk files is no longer visible using the file manager in Samsung Tab A (2019), neither is the path in main memory. The Path should be Android/data/com.esri.collector/files/basemaps. Android is trying to protect these program files. You would think that the easy solution is for Collector to just make a file dialogue that would let you put the tpks anywhere you wanted that was NOT protected. I found a work around thanks to YouTube University. Go to Google Play and download X-plore and it will let you have access, just be sure to change setting to see hidden files. Come on ESRI...keep up.
See this post from Field Maps board
It is an Android thing not really a Esri issue. This happened to all apps.
I do agree that it would be nice to use any spot, esp with 123 you have to double store them now. My idea is the images dir.