From OTRS:
https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom;TicketID=11192159#13501916

I store articles in reading lists to be able to read them when I'm offline. I often found that not all pictures of the article were stored although there was enough time before I went offline. My workaround is, while still being online, to scroll down through the article and stop at each image because that forces the app to load it, but that is also inconvenient. Can you please have the images stored automatically?