Hello Sebastian,

I've look inside the MediaController where the media uploader is using the PostAddFile() method and it's using the ToFriendlyName() to format the media name.

You can hook into the Media Service Events. https://our.umbraco.com/documentation/Reference/Events/MediaService-Events

Here's a sample proof of concept that I've played around using the MediaService.Saving event.

[RuntimeLevel(MinLevel = RuntimeLevel.Run)]
public class MediaComposer : ComponentComposer<SubscribeToMediaSavingEventComponent>
{
}

public class SubscribeToMediaSavingEventComponent : IComponent
{
    public void Initialize()
    {
        MediaService.Saving += MediaService_Saving;
    }

    private void MediaService_Saving(Umbraco.Core.Services.IMediaService sender, Umbraco.Core.Events.SaveEventArgs<Umbraco.Core.Models.IMedia> e)
    {
        foreach (var mediaItem in e.SavedEntities)
        {
            if (mediaItem.ContentType.Alias == "Image")
            {
                //overwrites the media name
                mediaItem.Name = ToSentenceCase(mediaItem.Name);
            }
        }
    }

    /// <summary>
    /// Converts a string to sentence case.
    /// </summary>
    /// <param name="input">The string to convert.</param>
    /// <returns>A string</returns>
    private static string ToSentenceCase(string input)
    {
        if (input.Length < 1)
            return input;

        string sentence = input.ToLower();
        return sentence[0].ToString().ToUpper() +
           sentence.Substring(1);
    }

    public void Terminate()
    {
        //unsubscribe during shutdown
        MediaService.Saving -= MediaService_Saving;
    }
}

I got the "ToSentenceCase()" method here.

Regards,
Vlael

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