Where am I supposed to save the tpk file on the SD card used in a Samsung Galaxy Tab A? The Collector app doesn't show the tpk file that I copied to the SD card. Thanks for anyone's help.
I found the answer here https://community.esri.com/thread/127792. Scroll down until you find Adam Olson's answer, which has screenshots and a detailed description. Thanks a bunch Adam Olson!
Here is the link to the Collector doc about this, too: Go offline—Collector for ArcGIS | ArcGIS