iPad won't bluetooth to MacBook Air

Because bluetooth pairing of an iPad, or iPhone with a computer has never been supported.

It's not necessary. Airdrop, continuity, handoff, etc. don't require traditional pairing. They just need to be in proximity and signed into the same Apple account.

See Why is bluetooth not supported on both iP… - Apple Community for links to articles about iCloud, Continuity features, and AirDrop.

There is also manual synchronization (e.g., of music purchased on CDs or through the iTunes Store) of Macs and iPhones or iPads, using the Music application, Finder, and a cabled connection.

Merlin1912 wrote:

Why won't my 6th Gen iPad not Bluetooth with my 2024 M3 MacBook Air I get a window saying macbook air is not supported?

What is your goal here? Not specifically the Bluetooth pairing, but why are you trying to establish that pairing?