DPMedia enhances the Joomla 4 core media manager with cloud storage and image editing plugins. Actually the free package contains an FTP, Pexels and Pixabay plugin for cloud storage and the filter plugin for image editing. With the filter plugin you can apply different filters to the image like sepia or grayscale.
The cloud storage plugin does allow you to integrate images from external services like FTP, Pexels or Pixabay into the core media manager.
DPMedia is a package of plugins which do extend the core media manager and is not a media manager in itself. Please head over to the product and documentation page where you can see what and how you integrate it.