Can't find Assets

I’ve been following a tutorial on youtube about creating a 2d character. Now, it’s all been partially working as seen in the video until when he added the: “Select”, node. In the select node, he can click on: “Select Asset”, button and he would get a drop-down menu with all the flipbooks he has in the content folder. But, when I click on the: “Select Asset”, button it always says: “No results, check your filter.”. I’ve checked every box in the: “View Options”, drop-down in the lower right corner but it didn’t change anything. Please help!

I’m a beginner so Idk what I’m doing.

Video: Unreal Engine 4 2D Platformer Tutorial - #11 Paper2D Animation State Machine (Flipbook) - YouTube