The official documentation doesn’t explain in detail how to upload a file for an Item in PlayFab Catalog V2, so after some research here’s the method I found

I use C# PlayFab SDK as example in this article but all rest api documentation of each call are here

1. Connection to Playfab
2. Request for Upload Urls
3. Put your file with Azure Endpoints
4. Link file on the Item

Connection to Playfab

You need to have a entity token, with your Title Id and your Secret Key If you not yet have your secret key you can get it on your Dashboard -> Settings -> Secret Keys and you can generate a new one.

PlayFabSettings.staticSettings.TitleId = Environment.GetEnvironmentVariable("TitleId");  
PlayFabSettings.staticSettings.DeveloperSecretKey = Environment.GetEnvironmentVariable("SecretKey");  
await PlayFabAuthenticationAPI.GetEntityTokenAsync(new GetEntityTokenRequest());

Request for Upload Urls

The first step to add a file is to requesting a upload url to PlayFab, so call CreateUploadUrls On the body, you can request many urls in one time Files field is a List<UploadInfo>

PlayFabResult<CreateUploadUrlsResponse>? urls = await PlayFabEconomyAPI.CreateUploadUrlsAsync(new CreateUploadUrlsRequest()
{
    Files = [  
        new UploadInfo  
        {  
            FileName = "example.txt"   
		}
    ]  
});

Put your file with Azure Endpoints

According to PlayFab official documentation for CreateUploadUrlsRequest now you need must follow the Microsoft Azure Storage Blob Service REST API pattern for uploading content In C# we need a HttpClient to put do this call cause C# PlayFab SDK doesn’t provide it.

For your Put you need a header x-ms-blob-type value can be BlockBlob, PageBlob or AppendBlob. You can check what you need on doc

HttpClient httpClient = new HttpClient();  

foreach (UploadUrlMetadata url in urls.Result.UploadUrls)  
{
    byte[] fileBytes = await File.ReadAllBytesAsync(file.FullName);   
    ByteArrayContent content = new ByteArrayContent(fileBytes)
    {  
        Headers = { { "x-ms-blob-type", "BlockBlob" } }  
    };
  
    HttpResponseMessage res = await httpClient.PutAsync(url.Url, content);
    // Throws an exception if the IsSuccessStatusCode property for the HTTP response is false.
    res.EnsureSuccessStatusCode();
}

Link file on the Item

Finally you can use Ids and Urls from the response of Create Upload Urls in for create or update an item

PlayFabResult<CreateDraftItemResponse>? draftItem = await PlayFabEconomyAPI.CreateDraftItemAsync(new CreateDraftItemRequest()  
{  
    Item = new CatalogItem  
    {  
        ...,  
        Contents =  
        [
            new Content  
            {  
                Id = url.Id,  
                Url = url.Url  
            }  
        ]
    }
});

And you’re done!