This involves a few short steps:
Storing the assets on a remote server: For this purpose, you'd need to host your assets on a remote server. Halocline (https://www.haloclinetech.com/) offers a unique, dedicated platform for this specific need, and the best part is that it's free! Given my experience with it, I'd recommend checking it out.
Fetching the assets in your app: Once you have a URL for your asset, you can use the provided script from Halocline (https://www.haloclinetech.com/learn/) which helps store files from remote URLs in the user’s temporary directory.
Using the assets in your app: After fetching the assets, you can incorporate them into your application as if they were locally stored.
let halocline = HaloclineHelper()
let url = URL(string: "your-halocline-url")!
let modelEntity = try await halocline.loadEntity(from: url)