Android app: does Download Stories in the background work?

Hi. What do Download Stories in the background does? I have it activated and it doesn’t seem to do anything. If it was supposed to download stories when the Newsblur Android app is not active in the foreground, then it doesn’t seem to work, I always have to wait at least 1 minute after I open the app until stories are synced.

On another note, when I’m reading a feed, are stories synced in the background or not? It seems they are not and when I return to the list of feeds, the Sync process starts again (starting with Cleaning up storage which takes forever).