You can find accurate location details for every photo taken or uploaded to your maps.
Firstly, click on the photo of interest from either the photos layer displayed on the map or the photos gallery view.
This will display the photo of interest in the middle of your screen with a toolbar at the bottom.
Drag the toolbar upwards to reveal additional information about that particular photo, including its location details.
By default, location details will be displayed in Latitude & Longitude format. You can switch between what3words and OS grid reference number formats by clicking the three horizontal dots to the right of the location details.