Hello ChiaraBee99,
To help us get a better understanding of the issue, we’d like to ask a few questions.
1. Does this only happen when the external microphone is connected, or does it happen at other times as well?
2. Do you receive any errors when this happens? If so, what does the error say?
3. Is this happening in the Apple Camera app, or another application?
4. Do you experience issues with other apps not working as expected when the external microphone is connected?
The above details will help us plan how to proceed.
If an app isn't working or responding as expected, please check out the information in this link, which may help with apps not behaving as expected: If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open
1. Close and reopen the app
Force the app to close. Then open the app to see if it works as expected.
2. Restart your device
Restart your iPhone or restart your iPad. Then open the app to see if it works as expected.
3. Check for updates
To see if updates are available for the app, open the App Store, tap your profile icon, then scroll down to see if updates are available. If updates aren't available for the app, update the software on your iPhone or iPad.
4. Delete the app, then redownload it
Delete the app. When you do this, you might lose data that was stored in the app. Then redownload the app. Then check to see if the problem with the app is fixed.
Get more help
* If the App Store itself is not responding, contact Apple Support for your iPhone or for your iPad.
* If you found the app on the App Store, contact the app developer. If the app is made by Apple or came with your iPhone or iPad, contact Apple Support for your iPhone or for your iPad.
* If you bought the app recently and you no longer want it, you can also request a refund.
Thanks!