is there a way I can update my iPad to 14.7.1?

You’ll not be able to update from iPadOS 13.6.1 to iPadOS 14.x - but can update directly to the most recent version of iPadOS - at the time of writing this being iPadOS 15.1.

Interim versions are not available to install - as Apple only offer the most recent version as a system update. 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. After a major update, such as the initial release of iPadOS15, the period that the preceding version is signed my be longer.

Not to exactly 14.7.1. Contact the people who developed the application.

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