Using a clip-on Mike with my iPhone 7 video recorder?

I have this connector adaptor that converts from a round plug to the flat one used by the iPhone 7.

Can you post a link to the adaptor you have and are trying to use, please?

here is is...

Am I missing some piece of hardware?

https://www.youtube.com/watch?v=VzGPyekZE7w

So it's a SONY ECMS3 Clip Style Microphone?

yes

Sorry newbieweb, but whilst I've used and had experience with several brands myself, I haven't used or had any experience with the SONY ECMS3 Clip Style Microphone before, so I'm not going to be able to offer any useful troubleshooting tips on this one.

Hopefully, some other experts will chime in to help you out, so I'll adjust your question topics shortly so as to make it possible for other relevant experts to be able to see and be alerted to your question. I'm afraid that's the only help I'm going to nr able to offer on this occasion.

Regards, Andrew

It seems like the challenge is on the iPhone itself.

I do not recall ever seeing an option to switch to a different audio input source, but I am in no way a power iPhone user.

So, if there is an iPhone user who is comfortable with reconfiguring, that is the question.

Can the built-in iPhone video app switch to a different input source?

If not, is there an alternative video app that does have such an option?

You'll need to convert the connection.  The plug has 3 metal segments for a stereo microphone connection, but they are basically the same as a stereo headphone connector.  When you plug it in to the iPhone adapter, your microphone connector is actually connecting to the headphone portion.

You'll need an adapter that splits the mono microphone out from the headphone.  https://www.amazon.com/Splitter-Headphone-Separate-Microphone-Smartphone/dp/B0773KV7Z3/ref=sr_1_17/135-4394945-3008740?s=aht&ie=UTF8&qid=1528172483&sr=1-17&keywords=headphone+jack+to+microphone+jack

So, that Mike was Mono that I posted?

I need stereo.

Is this a much better choice?
https://express.google.com/product/11791623422319740374_11682493938173385958_1057813?utm_source=google_shopping&utm_medium=tu_cu&utm_campaign=1057813&pdata=CgUzNS4yOA&utm_content=eid-lsjeuxoeqt,eid-rnamorziem

But I assume I would use the same connector to plug it inso an iPhone 7?

Once I have that plugged in, will the video app on the iPhone automatically use that external Mike?

thanks