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This is a paid asset, but now you can download Unity Camera Assistant Free.
Detail this asset from Unity Store: Original Link
Unity Camera Assistant v1.0
Unity Camera Assistant by MAROON3D- Easily store and view key angles; (Very comfortable when designing a large level)
– Store up to 10 banks
– Camera Post-Effects in editor view! (Except screen space parameters, such as SSAO and SSR)
*All data related to Camera Assistant are stored in scriptableObject, so you can restart Unity3D without losing any data..
Tutorial
Readme