Saving from iPad to SD card

Given that your description of your iPad Pro model strongly suggests that you don’t have a 2018/2020 model - that features USB-C - you’ll have an iPad with a Lightning port.

The simplest solution is therefore an Apple Lightning to SD Card Camera Reader:

Lightning to SD Card Camera Reader

https://store.apple.com/uk/xc/product/MJYT2ZM/A

Alternatively, if you already have an SD Card reader with a USB connection, you might instead use the Lightning to USB3 Camera Adapter - with which you can connect your existing SD Card reader simultaneously with your Power Adapter:

Lightning to USB 3 Camera Adapter

https://store.apple.com/uk/xc/product/MK0W2ZM/A

The native Files App will be adequate for most file types. Otherwise, you’ll be able to use the file sharing facilities from within most Apps.

The iPad User Guide will answer the majority of questions - this resource often being overlooked by users:

Apple - Support - Manuals