If your device doesn’t appear in the sidebar when connected to Mac
If you connected your iPhone or iPad to your Mac using a USB cable and don’t see it in the Finder sidebar, make sure that you have the right option selected in Finder preferences.
Important: Update your device to the latest version of iOS or iPadOS to ensure that it’s compatible with the macOS syncing features. For information about updating your iOS or iPadOS device, see the user guide for iPhone, iPad, or iPod touch.
Connect your device to your Mac.
You can connect your device using a USB or USB-C cable or using a Wi-Fi connection. To turn on Wi-Fi syncing, see Sync content between your Mac and iPhone or iPad over Wi-Fi.
In the Finder on your Mac, choose Finder > Preferences, then click Sidebar.
Below Locations, select the CDs, DVDs, and iOS Devices checkbox.
Check the sidebar again, below Locations, to see if your device is showing.
Click the device to see the syncing options.