Build on the template at the size it opens at, and do not scale the artboard. The measurements in it are the ones the plant presses from, so resizing moves the trim, fold and spine away from the machine that cuts them.
CMYK at 300 dpi
Set the document to CMYK and keep every placed image at 300 dpi at final size. Artwork built for screens in RGB will shift color on press, and an image that looks sharp on a phone can land soft at sleeve size.
Keep type out of the no-type areas
The template marks where text cannot go. Anything sitting in the trim, the fold or the spine zone can be cut through, folded across or hidden once the sleeve is assembled, so keep words and logos inside the safe area.
One spec, both factories
US and UK orders press to the same specs, so a template is right for either factory. The two 7 inch label templates are the two label styles rather than two regions, and both are valid.
For the square cover your release needs on streaming. That is a different file from these print templates, and this tool reads that one.
What stops a file pressing
The five ways artwork bounces
Built in RGB
Colour shifts on press. The document and every placed image go CMYK before export, not after.
A working file instead of the PDF
.PSD, .AI and .INDD are not accepted in any case. Export the flattened PDF and send that.
The wrong PDF flavour
Newer PDF versions can carry live transparency to press and change how the artwork prints. PDF/X-1a:2001 is PDF 1.3, flattened, and it is the export that presses as it looks.
No template underneath
Artwork built freehand lands without bleed and with the trim in the wrong place. Start from the template at the size it opens at.
A spine that does not match the quote
A 3mm sleeve on the quote with a 5mm template in the file is a remake, not a tweak. Match the template to the packaging you priced.
Artwork sorted? Price the pressing.
Configure the run and watch the real price move as you build. Your files come in after the order, built on the templates above.