eos m6 mkii - no wireless flash control

kli wrote:

azcii wrote:

... I just bought a 430EX III-RT for my M6 Mark II and I realized I can't use it wirelessly with my camera??

You can. You just have to buy additional gear.

No Canon camera has a built in radio RT transmitter to control flashes remotely over radio. Some Canon cameras (mostly dSLRs) have the ability to use Canon's "smart" optical system to remotely control/fire flashes with a built-in/pop-up flash. In the EOS M lineup, that's apparently reserved for the M5 and M50 lines.

And Canon speedlights don't have dumb S1/S2 optical slave modes that will fire the flash remotely from any flash burst. [But, you'd have no setting remote control, TTL, or HSS. Just the ability to fire the flash off-camera.]

... Is there something similar I can buy for my M6 that will work to trigger my flash wirelessly?

You'd need to have a radio RT flash transmitter on the camera's hotshoe to fire the 430EX III-RT off-camera over radio. A Canon SS-E3-RT, another 430EX III-RT, 600EX-RT or 600EX II-RT, or some third-party alternative (Yongnuo YN-E3-RT, Phottix Laso, Jinbei TR-Q7, etc.)

But if that's too expensive, you could try using Canon's "smart" optical system which is older, with the older gear (580EX, 580EX II, ST-E2, or 3rd party alternative that can be an optical master unit. etc.)

But most of us? We just don't go with Canon OEM flashes and use Godox's system instead. While a TT685-Cis not as nice on TTL accuracy/consistency or head rotation or AF assist as a Canon EX speedlight, it can do roughly 90% of everything a 600EX-RT can do, and a bunch of stuff the 600EX-RT cannot (like dumb S1/S2 modes). And it's $110. And an Xpro-C or Flashpoint R2 Pro II-C transmitter to use it off-camera costs $70. A the smaller TT350-C ($85) isn't as nice as an EL-100 for on-camera bounce flash, but it has a built-in radio transceiver and can be part of an off-camera flash system in a way the EL-100 cannot.

So, +1 on seeing if you can return the 430EX III-RT and taking a look at Godox's gear instead.

+1 regarding Godox. Another good reason for Godox is the fact that it caters to all of the major systems (sony, nikon, canon, fuji... etc).

So if you are going to be serious about flash photography you may eventually end up with 2-3 lights. If in the future you decide to switch brands you don't need to switch all your lights as well. You would just need to get a transmitter for that system, and probably a flash to mount to the camera. The rest will work with the trigger. 
Additionally godox also has the other options like strobes which are also compatible with their trigger