V3S Development Board

The SnailCard_v3s referenced here: SnailCard_v3s - JLCPCB EDA Open Source Hardware Platform (oshwhub.com).
For the TF card slot, I suggest changing the package; otherwise, the purchased slot will have two extra points that need to be ground flat before soldering
the battery charging and power supply. I haven't verified this yet, but theoretically it should be fine
. A floating screen does look bad, but I'm too lazy to change it. You could also glue it in place.
The Wi-Fi signal isn't very good; you could try changing the antenna.
The audio is fine .
Initially, the USB didn't respond when connected; I later discovered the problem was that the USB-ID was pulled high and became a device; it needs to be pulled low to become a host.
With OTG mode enabled, I suggest replacing the USB with a through-hole connector; surface-mount components are very sensitive to excessive force.
If you don't want to solder the charging and power supply parts like me, just short the U4 connector.