Skybox resolution?

Hello devs! Is there a set resolution for skyboxes - or a maximum number? I would like to make one in ProCreate but so far only have seen how to make a skybox on Photoshop. There are multiple functions being used that ProCreate does not have, for example slicing up the picture? But most importantly, I have not yet seen anyone talk about any kind of resolution, although the skybox is a raster image

The sky box has the same limit as all other images.
1024x1024 px. Although each face of the box can get a separate image.

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