Why doesn't AutoPlay pop up anymore when I plug in a USB drive?

Because the drive appears normally in File Explorer, Windows recognizes the device; the missing behavior is AutoPlay notification or action selection. You have enabled AutoPlay and reset defaults, so test whether the problem affects both a USB storage drive and an SD card. In Settings, confirm that Use AutoPlay for all media and devices remains enabled and choose a default action for Removable drive. Disconnect the device, restart the PC, then reconnect it directly to a different USB port rather than through a hub. If it works for one device type only, its media type or driver is relevant; if it fails for all types, compare the result in a local user account. That separates a profile-level setting from a system-wide issue. Avoid registry fixes from unverified posts. Capture the Windows version, device type, and test-account result before escalating, because the symptom alone does not establish an update-related cause.