Hi,
@appyet! In the RSS module where I would like to have this function, you can see the incidents of the metro service of a city. There are 12 lines in total, and each of them has an RSS feed (right now, I think it is not feasible to make a module for each feed, because there are many and the app has many more functions).
Unfortunately, the operator of the service and creator of these RSS feeds has not configured any way to differentiate which line each incident is from, making it difficult for the app user to see it. What I want to do is to be able to configure the logo of each line as the cover photo in its corresponding feed in AppYet, so that each post would have the logo of its line as an image.
As a conclusion, I think it would be the creation of a new field in each feed called "Fallback image", which is the image to display if there is no photo in the article.