Cloud services to sync photos in an IOS app?

Question

Cloud computing

Guys, I’ll explain the situation, I’ll say right away, the questions will probably seem a little childish to you, but we don’t understand anything about this, so we ask: We are planning an application for IOS, we want users to be able to upload their photos and videos to the application, make a limit of 500 MB per user .
But before giving an order for the development of applications, we want to calculate the costs, so:
1) How does it generally look like, a bunch of cloud-applications? The user uploads a photo to the application, and then it goes to the cloud? And if he deletes, then immediately deletes from the cloud? And how is the size determined for all users? Let's say 1000 users = 500gb, but do we have a cloud limit for all 400gb? what will happen in that case?
2) And the most important question, where can I find out the prices? Or approximate prices at least?

Answer 1

What does it look like, a cloud-application bundle? The user uploads a photo to the application, and then it goes to the cloud?

The user opens access to the application to his photos, after that, through the Api, the photos are sent to your server / cloud.
In the application, the user selects "delete" the photo, after which an Api request is made, which leads to the deletion of the photo in the cloud.
This is the beauty of the cloud - you can easily and quickly increase storage, so there should be no limit.
Look at the prices of the main cloud hosters, they often also have calculators that are convenient. A couple of links: AWS , GAE , Azure .
PS In general, the competitiveness of such an application is doubtful, because. there's Flickr, which provides 1000GB for free, and Google Photos with generally unlimited free storage.