UsersManual/index.rst: Upload updated.

extension/Documentation/UsersManual/Index.rst

@@ -909,13 +909,29 @@ current record either to finalize the upload or to delete a previous uploaded fi
 
 * FormElement. *parameter*:
 
-  * *fileDestination*: Destination where to copy the file. A good practice is to specify a relative fileDestination - such an
+  * *fileDestination*: Destination where to copy the file. A good practice is to specify a relative `fileDestination` - such an
     installation (filesystem and database) are moveable.
-  * If the final fileDestination should contain the original filename,
-    the variable *{{_filename}}* can be used. Example::
+
+    * If `fileDestination` should contain the original filename, the variable *{{_filename}}* can be used. Example::
 
       fileDestination={{SELECT 'fileadmin/user/pictures/', p.name, '-{{_filename}}' FROM Person AS p WHERE p.id={{r}} }}
 
+    * If a file already exist under `fileDestination`, an error message is shown and 'save' is aborted.
+       The user has no possibility to overwrite the already existing file. If the whole workflow is correct, this situation
+       should no arise.
+
+    * All necessary subdirectories in `fileDestination` are automatically created.
+
+Deleting a record and the referenced file
+.........................................
+
+If the user deletes a record which contains reference(s) to files, such files are deleted too.
+
+Only columns where the columname contains `pathFileName` are checked for file references. Therefore, always choose a
+columnanem which contains `pathFileName`.
+
+If there are other records, which references the same file, such files are not deleted (but the record is deleted).
+It's a very basic check: just the current column of the current table is compared.
 
 .. _class-action: