According to reports, this option is available in the Google Photos app, version 7.24.0.747539053. Most people probably have this version of Photos installed ...

Google Photos now lets you upgrade existing pictures to Ultra HDR after the fact, bringing new life and vibrant colors to ...

Summary: Google Photos is rolling out an Ultra HDR editing option that lets users upgrade older images with vibrant contrast ...

Many recent smartphones shoot pictures in Ultra HDR format, which captures more colors and a much greater range of brightness than standard pictures.