Open sequence of images as animation not working on macOS

Just as the title states.
It only opens them as single files.
The dialogue that is supposed to ask, doesn’t even show up.
I tried setting the ‘Open a sequence of static files as an animation’ option from ‘Ask’ to ‘Yes’ which didn’t help.
I tried changing the files from webp to png, which also didn’t work.
The images are different sizes, but this didn’t stop it from working in Windows.
I recently switched from Windows, so I have no experience of using this feature on macOS.

OS: macOS 12.3.1 (M1 pro)
Aseprite version: v1.2.34.1-arm64