How do I Import A Sprite Strip (Yes, Seriously)

Okay, I don't know what's going on here. It's been awhile since I've used Construct 2, but I've just downloaded the newest version, so something may have changed. To import a sprite strip, I remember right-clicking the animation frames window after importing a sprite, and it would give me options like Import Strip, Import Frame, etc.

Now when I right-click, i get nothing except Duplicate and Thumbnail Size. There is no longer an option to import a strip.

Where should I look/what should I do?

Right click the white area of that window, not the existing frame.

Thank you so much!