Q: i cannot send voice memo with whatsapp

Hello kilty66,

Thank you for using Apple Support Communities. 

I see you are having issues using WhatsApp on your iPhone. The following article provides some steps that could be useful with your issue:

If an app you installed unexpectedly quits, stops responding, or won’t open

In your case the section on "Install another app from the App Store" would not be applicable in your case, as you have tested another app that works.

Best regards.