You are building a Drupal site that makes great use of imagery Photos are used...

Since the images need to be displayed in many different sizes, they should be uploaded into the body field, and resized in the WYSIWYG to whatever size is needed

Use the core Media module with media type "Image" to store the images Create reference fields in the entities to include the images

On the entities that need images, create a "File" field Upload images to each entity that needs them

Use the contributed Media module and create media type "Image" to store the images. Create reference fields in the entities to include the images