View of attached files to a node
The D8 Editor File upload is using the Drupal file system, so the files uploaded through module do have FID and can be listed in Views. 

Here are steps to create a block to show only the files used on the currently visited node:


Create a View of type File with a Block display showing Filename (you probably have this already)
Add a Contextual filter in your Views Block Display called Entity ID from the File Usage Category. 
Adjust the settings for that Contextual filter:
When the filter value is NOT available
Provide default value
Type to Content ID from URL
When the filter value IS available or a default is provided:
 Specify validation criteria
 Validator to Content
 Content type [choose appropriately]
 Leave the rest as default  
Place the Block in a region you like, adjust the Block options File Usage: Entity ID to Node from URL and restrict to display only on relevant Content types.


Now when you visit nodes of the types you selected in Block and Contextual filter settings will list only the files uploaded to those nodes.