Step 22 – Start thinking on the animation, add a Mask.

Now we have all the Background layers created (inside a folder named "Feed Background"), and the title and icon outside. Now create a rectangular vector Rectangle above the "Feed Background" named "Mask". This will be a future mask to hide the visibility of the set of News that this feed will have. But don’t worry about it yet, just change it’s Blending Mode to Multiply.

Step 23 – Add an article

Each row in our app, will contain several articles, let’s add one (I’m using several articles of tuts+ network as samples). Place a rectangular picture between the "Mask" layer and the "Title" layers – see the screenshot below. Repeat the process described on the Step 8 to create a shadow divider, and change it’s Opacity to 50%.

Step 24 – Article Content

Let’s add a Title for our article, a line of metadata and a brief paragraph of text. See the following screenshot to see the suggested typography and colors. Finally put all the layers related to an article into a folder named "Article".

Step 25 – Add more articles

Add more articles, until fill the entire row. Once you run out of space, select all the article folders you just created (Command/Ctrl + Shift on the Folder miniatures on the layers panel) and drag them to the left as necessary to add another article at the right. Add as many articles as you want, finally drag all the articles back to the original position (with the first article left aligned with the feed background).

Step 26 – Convert the articles into a Smart Object

Put all the articles into a new Group named "Articles". Ensure the folder can be dragged left and right as shows the image below. Then convert the Folder into a Smart Object. Then, convert the "Mask" layer into a Clipping Mask (Option / Alt click between the "Articles" Smart Object and the "Mask" layer). Now, try to drag the "Articles" object left and right, the "Mask" layer should hide the articles outside the Mask area. At this point this news feed actually have all the layers necessary to animate its behavior.

Step 27 – Add more Feeds

Now, add many rows of news feeds, and put each row into a Folder with its respective name: "Feed1", "Feed2", etc. Then add all the feeds into a new folder called simply "Feeds". You can duplicate the background and create different articles inside each one, but DO NOT duplicate the "Articles" smart object from the first feed, just create one from scratch. Ensure the entire "Feeds" folder is easily draggable from top to bottom and vice-versa. You can even add a couple of feeds with only text on them. (editor：admin)