This is likely to be more pertinent as users start being able to add to reading lists from desktop browsers and multiple devices, for example, as seen in this OTRS report: https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom;TicketID=10661383
=== User story
As a reading list user who wants to conserve data usage, I want to be able to stop downloading synced articles to my device when so that I do not waste mobile data.
=== Proposed solution
Add a setting to the "Data usage" section of the app which enables users to "Download on WiFi only".