AnkiDroid doesn't detect apkg file in the requested location I have Android 4.1.1 and my AnkiDroid version is 2.3.2. I have downloaded a deck (.apkg file) and I would like to import it into AnkiDroid, which requires me to place the file into a specified folder /storage/sdcard0/AnkiDroid.

Oddly enough, the AnkiDroid folder didn't yet exist, so I went on and created it, paying attention to the proper 'CamelCase' in the name of the folder. I have copied the .apkg to this folder but I cannot import it because AnkiDroid cannot find the .apkg in that folder. 

What is the problem? How to fix it?
Strange, it should be seen in the Import dialog. Please fill a bug report at https://github.com/ankidroid/Anki-Android/issues thanks!

Meanwhile, you can use the second method for importing a .apk file:
https://ankidroid.org/docs/manual.html#_open_the_file_using_android
Just install any file explorer (like File Manager), and tap your .apkg file. It will open in AnkiDroid.