Folders are dark-yellow (amber) in both mockups. The only thing changing is the file-name color: neutral vs. cool cyan. Compare below.
Use the Light / Dark toggle above to see both — it matters. The Locker sits on a normal iOS list, so a pale “off-white” file color looks great in dark mode but nearly disappears on a light list. The neutral option below is the system label color (off-white in dark, near-black in light) so it always stays legible; the cyan option is an adaptive phosphor that reads on both.