CAn I upload an older version of ipad IOS

Rolling-back to an earlier version of iOS/iPadOS is not possible.

All System Updates are digitally signed by Apple - and can only be installed whilst the digital signatures remain valid. After release of a new iOS/iPadOS version, the immediately preceding version continues to be digitally signed by Apple - however, usually within a few days, Apple will revoke the digital certificate with which the earlier version is signed.

If Apps no longer work properly following update to a more recent version of the OS, you’ll need to seek assistance from the related App Developer - as only they can resolve issues with their App.

How to contact an app developer - Apple Support

Perhaps consider that iOS/iPadOS updates include both functional and essential security updates. Restoring an earlier version of the OS would undermine the security of your device and your personal data. 

Downgrading an iOS version is not supported by Apple. The answer to your question is a NO.

Axel F.

thursday58 Said:

"CAn I upload an older version of ipad IOS: CAn I upload an older version of iPad IOS"

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Downgrading the iPadOS:

A "Downgrade" seems what you are looking to perform --not an "Upload". So, no, downgrading the iPadOS is not an option. That's just the way Apple designed the iPadOS.

No.