Where do I need to place content on android mobile to launch it?

1 I created a course in Storyline 2

2 I selected the publish options: include html5 output, Use artculate mobile player for IOS or android, allow downloading.

3 I copied the files to the internal memory of my mobile (android) in the DOWNLOAD directory

4 I downloaded and installed the Articulate Mobile player

When I open the player I get the message No Content (and do not have an option to browse for content)

When I go to the course directory and click on story.html I see an empty page and the Mobile Player is not launched.

Question: where do I have to put the course so the player can find the content?

Is there another way to get it working?

thanks

jean