In Riga & Brooklyn designs, the image set as an album cover will not appear in the album itself. This behavior is for a purpose: Riga has only portrait mode album cover, Brooklyn has only landscape mode album covers. So if you have a different image format set as the album cover, it can appear cropped in the wrong way. Therefore you select another image as the cover. You can crop the image you want for the album cover view and upload its usual format for the display within the album.
Image is not fitting well into the album cover placeholder of Brooklyn template.
Same image cropped in ladnscape mode set as cover (1). The "normal" image is within the album (2)
(The image set as cover, will not repeat in the album itself).
Image cropped set as cover
Same image in the album in its original format.