Images yml

web/modules/custom/uvf_migrate/config/install/migrate_plus.migration.portfolio_csv_import.yml

@@ -70,7 +70,11 @@ process:
       method: row
       source: field_theme
       message: 'Field field_theme is missing'
-  field_thumbnail: field_thumbnail
+  field_thumbnail: 
+    -
+      plugin: migration_lookup
+      migration: portfolio_thumbnail_csv_import
+      no_stub: true
 
 destination:
   plugin: entity:node

web/modules/custom/uvf_migrate/config/install/migrate_plus.migration.portfolio_thumbnail_csv_import.yml

+id: portfolio_thumbnail_csv_import
+label: Import Portfolio Thumbnail
+migration_tags:
+  - CSV
+migration_group: my_custom_migrate
+
+source:
+  constants:
+    source_base_path: /var/www/html/uvf/unicef-if-qed42/docroot/sites/default/files/photos
+    destination_base_path: public://photos
+  plugin: csv
+  path: public://import-sources/portfolio_csv.csv
+  ids:
+    [nid]
+  delimiter: ','
+  enclosure: '"'
+  header_row_count: 1
+  keys:
+    - field_thumbnail
+
+process:
+  source_full_path:
+    -
+      plugin: concat
+      delimiter: /
+      source:
+        - constants/source_base_path
+        - field_thumbnail
+    -
+      plugin: urlencode
+destination_full_path:
+    -
+      plugin: concat
+      delimiter: /
+      source:
+        - constants/destination_base_path
+        - field_thumbnail
+    -
+      plugin: urlencode
+uri:
+    -
+      plugin: file_copy
+      source:
+        - '@source_full_path'
+        - '@destination_full_path'
+destination:
+  plugin: 'entity:file'
+migration_dependencies:
+  required: { }
+  optional: { }
\ No newline at end of file

web/modules/custom/uvf_migrate/uvf_migrate.install

@@ -26,7 +26,8 @@ function uvf_migrate_uninstall() {
    'migrate_plus.migration.taxonomy_term_tags_csv_import.yml',
    'migrate_plus.migration.taxonomy_term_team_member_csv_import.yml',
    'migrate_plus.migration.taxonomy_term_themes_csv_import.yml',
-   'migrate_plus.migration.user_csv_import.yml'
+   'migrate_plus.migration.user_csv_import.yml',
+   'migrate_plus.migration.portfolio_thumbnail_csv_import.yml'
   ];
   foreach($configs as $config){
     $delete = \Drupal::database()->delete('config')