I'd like to import a spritesheet in a specific manner

Hello, I am looking to import this spritesheet as animated sequences but can’t quite figure out how I’m supposed to go about doing it.
The main issue is it won’t let me crop out the right part of the spritesheet as an ending point, even though it will let me do so for the left side.

Video example: Watch Game Boy Advance - Metroid_ Zero Mission - Playable Characters - Samus Aran (Power Suit).png - Aseprite v1.3.14.3 2026-03-26 21-28-08 | Streamable