How to send a collection of files + JSON data to the client side - asp.net

Question

In my ASP.NET Core Web API I have an entity Idea:
public class Idea
{
public int Id { get; set; }
public string Name { get; set; }
public string OwnerId { get; set; }
public User Owner { get; set; }
public string Description { get; set; }
public int? MainPhotoId { get; set; }
public Photo MainPhoto { get; set; }
public int? MainVideoId { get; set; }
public Video MainVideo { get; set; }
public ICollection<Photo> Photos { get; set; }
public ICollection<Video> Videos { get; set; }
public ICollection<Audio> Audios { get; set; }
public ICollection<Document> DocumentsAboutTheIdea { get; set; }
public DateTime DateOfPublishing { get; set; }
}
public class Photo
{
public int Id { get; set; }
public string Url { get; set; }
}
(the different media-type classes are equivalent)
When the client makes a Post request for creating the Idea he sends the information about it along with all the media-files (I am using IFormFile and IFormFileCollection) and while saving them on the server I set the Url property to match their location. But in the Get request I want to send the files (not Urls).
Here is the Get action which now returns only one file (mainPhoto) without any JSON and without any other media-files:
[HttpGet("{id}", Name = "Get")]
public async Task<IActionResult> Get(int id)
{
var query = await unitOfWork.IdeaRepository.GetByIdAsync(id, includeProperties: "Owner,MainPhoto,MainVideo,Photos,Videos,Audios,DocumentsAboutTheIdea");
if (query != null)
{
string webRootPath = hostingEnvironment.WebRootPath;
var path = string.Concat(webRootPath, query.MainPhoto.Url);
var memory = new MemoryStream();
using (var stream = new FileStream(path, FileMode.Open))
{
await stream.CopyToAsync(memory);
}
memory.Position = 0;
return File(memory, GetContentType(path), Path.GetFileName(path));
}
return NotFound();
}
So in a Get request I want to send to the client side (an Angular app) some of the information about the Idea in a JSON-format ALONG WITH different (NOT ONE) media-files associated with it. My goal is to make the client side get it all so that it can then show them on the page of the info about the Idea. But I cannot figure out the approach for this. Is there a way to achieve this? Or there is another (better) way of interacting with the client side to transfer all the required data? I tried to find information on this topic but couldn't find any.