Each section has it's own scroll bar on the right. You may need to give it a little time to load.
Click any GIF for full-size version. Click the title of the section to go to the Drive folder containing the GIFs. All GIFs can easily be inserted into Slide file using "Insert", "Image", "Drive" and choosing the GIF you wish to insert.
Note: pages may not load or function correctly on an iPad.