It's not an app issue, but a result of the content team not having generated the content yet for the content source that the app uses (version 3 of Android's Gospel Library shares its content with the app and also has this issue).
It's the same reason that the magazines take forever to appear in the legacy Windows app (version 2). See also:
https://tech.lds.org/forum/viewtopic.ph ... 05#p167405
If you still can't get the content even after the content update is pushed, you may need to redownload the April 2017 General Conference. (Delete the content, close the app, then open the app again and redownload it). This helps to ensure old content isn't getting stuck (which can happen if the content team fails to increment the content version number).