Post a photo with Postman
In Postman configure a folder o a collection to send the authorization token.
Create a new Request of type POST.
In the Body tab set it to send form-data and add a Key named File (like the PhotoForCreation property) and set it of type File. Choose a test picture from your filesystem. Save the request but don’t send it.
In visual studio code attach the debugger and set a breakpoint at the start of AddPhotoForUser.
Send the request with Postman.
Follow the code and be sure that everything is ok.
Check the results
Go to the Cloudinary dashboard and find the uploaded image. Open the image and check the PublicId.
Using Db Browser fro SQLite open the Photos table: there is a new item with the same PublicId.