Macs do not see Android phones the way Windows does. There is no Finder sidebar entry and no drive icon. You need three things: a data cable, the right USB mode on the phone, and a Mac app that speaks MTP, the file-transfer protocol every Android device uses.
Use a cable that carries data (the one in the phone's box does). Plug it into the Mac directly, not a hub, and unlock the phone. Android keeps its storage hidden while locked.
Swipe down from the top of the phone's screen. You will see a notification like “Charging this device via USB”. Tap it, tap it again if it says “Tap for more options”, and choose File Transfer (also called MTP or “Transfer files”). On Samsung phones the option lives under “USB controlled by: This phone” → “Transferring files”.
Do not choose “Transfer photos / PTP”: that mode only exposes the camera roll and Finder will treat the phone as a camera.
With Plugged, the phone appears the moment it is in File Transfer mode: a Finder-like window with Internal Storage and the SD card in the sidebar. From there:
DCIM/Camera – photos and videos you shotPictures/Screenshots – screenshotsDownload – files saved from the browserMovies, Music, Documents – what they sayWhatsApp/Media or Android/media/com.whatsapp – WhatsApp photos, depending on the phonePlugged detects each of these situations and shows the matching step on screen, including the name of the app that is holding the phone.
Plugged – Transfer for Android
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For a few files, a wireless tool such as LocalSend (free, needs an app on both sides) is convenient. For a camera roll or a movie folder, the cable wins: MTP over USB does 20–40 MB/s on USB 2 phones and more on USB 3, and it does not depend on your Wi-Fi.