Q: Paste isn't working in iOS 10 mail app

Hello there, Carefreelynn!

Thanks for reaching out to Apple Support Communities! It sounds like you are having issues pasting on your emails in your iPad. I know how important it is to be able to paste properly. First, check out this article with steps to Restart your iPhone, iPad, or iPod touch. 

The next thing you might want to try is going to Settings on the iPad and then to Reset. Once there, tap Reset all Settings. This will reset the iPad settings, but not erase personal information such as photos, contacts, or music. It will, however, remove Wi-Fi and VPN settings so be sure you have those settings and passwords ready for when the iPad is started back up.

If that doesn't work, it would be a good idea to be sure there is not a software issue as the root cause of this for you.

1. Check out this article for the steps for How to backup your iPhone, iPad, and iPod touch. 
2. Use this article for the steps to Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings.
3. Once that is done, set the iPad up as new and test to see if the issue is still going on. Then, follow this article to Restore your iPhone, iPad, or iPod touch from a backup

Have a great day!