can i insert a pendrive to my apple ipad pro

iPads do not support usb drives directly. There are some wireless drives that can be used with iPads via their own Apps.

Here are some options:

http://www.macworld.co.uk/feature/iphone/best-ways-get-more-storage-for-your-iph one-or-ipad-3579792/

if you want to import media from a pen drive, for example photos, use the Camera Connection Kit.

You can't use a conventional USB drive, but you can use a SanDisk iXpand.