If the preview image is very large (eg 1000x1000px), when the pack is selected in the list, the image will then be shown at its full scale and cover the entire Custom Assets window thus making it unusable. The preview image should instead be scaled down to fit the preview area to the right of the packs list.
If the preview image is very large (eg 1000x1000px), when the pack is selected in the list, the image will then be shown at its full scale and cover the entire Custom Assets window thus making it unusable. The preview image should instead be scaled down to fit the preview area to the right of the packs list.