Why won't my emails automatically pass over to the iPad when I connect to my computer?
why doesn't my iPad mini 6 automatically get my email accounts when I attach it to my computer?
iPad mini 6 Wi-Fi, Cellular
Your iPad retrieves email directly from your email provider’s Mail server (not through synchronising with your computer) - but only if you have added your Mail account to your iPad:
Add an email account to your iPhone, iPad, or iPod touch - Apple Support