You have a choice somewhere in the USB settings.
There's MTP, PTP and none of the above.
ADB is a separate option.
If your PC is Windows, the first thing to check is whether your PC goes "bong" when you plug in your Lumi2.
You may have a bad cable, a bad Lumi2 connector or nothing enabled.
MTP enables you to see file in Windows File Explorer.
ADB enables you to manually transfer files or use utilities to transfer files.
Me, I just use ADB to synchronize all my devices.
You'll need to load drivers for ADB and the ADB client program itself.
Google "minimal ADB".
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