Cannot get custom posts by category

You can try using cat or category__in (for array of categories) instead of category-name and assign an ID to it:

$args = array(
    'posts_per_page' => 6,
    'post_type' => 'albums',
    'cat' => 4,
);

I also would use single quotation ' instead of double quotation " while setting a value. You are also missing quotations around your post type, which should be 'albums' instead of albums.

For further reading, check the codex page for WP_Query.

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