https://wccftech.com/apple-releases-new-public-beta-of-ios-15-macos-monterey-watchos-8-and-tvos-15/

Today, Apple has seen fit to release the third beta of iOS 15, iPadOS 15, tvOS 15, watchOS 8, and macOS Monterey to the public. The betas are available for everyone interested in trying out the upcoming software updates from Apple on their compatible devices. If you are up for it, you can download and install the latest betas from Apple's beta testing website.

iOS 15 and iPadOS 15 public beta can be downloaded from Apple's Public Beta website if you have signed up for it. If you have, you will receive an over-the-air update on your iPhone or iPad. Simply make sure that you have installed the correct configuration profile from the Public beta website. The new beta will bring a boatload of new additions to the table as well as stability and performance improvements. So be sure to try it out on your compatible iPhone and iPads.