Files Created On External Storage Do Not Show Up When Device Is Mounted On Windows/mac

I have a simple application that attempts to save some data to external storage on Android device (Nexus 4) to be later retrieved on PC (Windows or Mac). The writing succeeds but w

Solution 1:

see here

Use the app sd scanner, it seems to work on my Nexus 7 with android kitkat

Solution 2:

I experienced similar problem with Android 4 and Mac os. I guess that you might be in the same situation. The solution was to rescan the sd storage using SDrescan.

This is described here: Nexus 4 not showing files via MTP