That is really a good question because images do not go “into a post”. You actually know the answer, you just might not be aware of it. When you prepare a post, starting at WordPress.com, and you click the circled-plus icon to “insert contents”. It opens an overlay that shows your “Media Library“. It will look a bit like this:
You can click on an image and then you’ll get an “Insert” button. This tells you already that your images are stored in your “Media Library“. If you wish to insert a photo that is on your computer you would click Add New. That opens another window, this time one that shows the files on your computer, and you can select the photo to upload to your Media Library.
As soon as you have selected the image and clicked Open, the file window closes and you are back to the Media Library, but now it shows the newly uploaded photo and it is already selected for you. Just click Insert and it is in your post.
There is another hint in the insert-option window. Take a look at the illustration above once more, but look in the lower left corner. There is tells you how much of the storage space you are using.
With your WordPress blog account you also get 3 GB of storage space. That is where your images are stored. In the “basement” of WordPress, I should probably have said in the WordPress server “cloud”. If you are using a self-hosted blogging account it is just a bit different since you will be storing your images on servers at your hosting service.
© 2017 Ludwig Keck