Does not work here.
I took these 2 images:
The first is named KM Circle@2x.tiff and the smaller one KM Circle.tiff
Then i combined them by using the command:
tiffutil -cat KM\ Circle.tiff KM\ Circle@2x.tiff -out KM_Circle.tiff
The file is created but not used if i do the same with multiple images and put them in an archive, like i did in my Radar Icon Project. I even reversed the order of the two images combined with tiffutil. And i tried it with lzw compressed images too.
Is there a minimum number of images needed for an animated Status Icon?