doc: extra doc from native api guide

Author: g-saracca

docs/useCases.md

@@ -1226,6 +1226,12 @@ _See [use case](../src/files/domain/useCases/DeleteFile.ts) implementation_.
 
 The `fileId` parameter can be a string, for persistent identifiers, or a number, for numeric identifiers.
 
+Note that the behavior of deleting files depends on if the dataset has ever been published or not.
+
+- If the dataset has never been published, the file will be deleted forever.
+- If the dataset has published, the file is deleted from the draft (and future published versions).
+- If the dataset has published, the deleted file can still be downloaded because it was part of a published version.
+
 ## Metadata Blocks
 
 ### Metadata Blocks read use cases