Follow these steps to get your Slack eBooks on an iPad or Android Tablet:

• Download and install the iPad app in the iTunes store:
  
  
• Download and install the Android app on GooglePlay: 

After the app is installed:

• Tap on the + to select the Publisher.

• Choose Slack.

• Enter your username and password in the log in window and click " Sign In "

• The Bookshelf will open up with the thumbnail view (greyed out) of subscribed eBooks.

• Select the eBook and tap on Add .

• The eBook will get downloaded and will appear on the "All Books" Tab.

• Tap on the eBook to read.