Your dash cam records every drive to its own memory card. This app is how you get at that footage: browse the card, watch live view, and pull the clips you care about onto your phone. Dash Cam is a remote and a viewer for a standalone dash cam already mounted in your car. It does not record using your phone camera.
VIOFO A119 Mini 2, A129 Plus Duo and A139 Pro. Rexing V1-4K, V1P Pro and S500. REDTIGER F7N and F17. AZDOME M550 and GS63H. BlackVue DR590X, DR770X Box and DR900X Plus. DDPai Mini 5, Mini Pro, Z40, Z50 and N2 Dual. Garmin Dash Cam Mini 2, 47, 57, 67W and Tandem. Nextbase 322GW, 422GW, 522GW, 622GW and the iQ series. Beyond those, the app reaches many unbranded cameras that broadcast an NVTCAM, CARDV, CARCAM, AMBA or YDXJ network, because they are built on the same chipsets.
Those two pair over Bluetooth first and hand the Wi-Fi password to their own app. Read the Wi-Fi name and password from the camera's own settings menu, join that network by hand, then open Dash Cam.
The camera's Wi-Fi network is a link between your phone and the camera and does not lead anywhere else. That is normal. Your usual network works again once you rejoin it.
Downloads run at roughly 2 to 5 MB/s, so a one minute 4K clip takes about a minute to copy across.
A purchase is required to use the app. It is sold weekly, yearly, or once for lifetime access, and the price in your currency is shown before you confirm.