Hello. I am making an app that allows you to save your uploaded or camera photo urls to a sharepoint list.
Here the user can select to either upload or take a photo. Once that's done I save the urls to my sharepoint list.

Here is my sharepoint list's field where I store those urls.

I can test that these urls work since I can view them in a gallery that uses this list as its data source.

My question is: Where exactly are these images being stored? My company wants to know just in case these might be costing something. Thanks.