Importing downloaded files into UE4

Below is the code snippet that writes the files.

// Saves Files onReady
void UDownload::OnReady(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful)
		FString FileSavePath = FPaths::ProjectContentDir() + Asset;

		if (Response.IsValid() && EHttpResponseCodes::IsOk(Response->GetResponseCode()))
			IPlatformFile& PlatformFile = FPlatformFileManager::Get().GetPlatformFile();

			// Open/create the file
			IFileHandle* FileHandle = PlatformFile.OpenWrite(*FileSavePath);
			if (FileHandle)
				// Write the file
				FileHandle->Write(Response->GetContent().GetData(), Response->GetContentLength());
				// Close the file
				delete FileHandle;

void UDownload::OnProgress_Internal(FHttpRequestPtr Request, int32 BytesSent, int32 BytesReceived)
	int32 FullSize = Request->GetContentLength();
	OnProgress.Broadcast(BytesSent, BytesReceived, FullSize);

What is format of those files?

Ok so raw files. You can import using AssetTools module

With this function:

Just give it array of file paths. This function should automatically pick up registered UFactory from plugin