#399

backend/app/controllers/post_imports_controller.rb

@@ -11,7 +11,12 @@ class PostImportsController < ApplicationController
 
   def validate
     rows = normalised_import_rows allow_warning_fields: true
-    changed_row = Integer(params[:changed_row], exception: false)
+    changed_row =
+        if params[:changed_row].to_s == 'all'
+          true
+        else
+          Integer(params[:changed_row], exception: false)
+        end
     result =
         PostImportPreviewer.new.preview_rows(rows:,
                                              fetch_metadata: changed_row,