File type metatags migration from Drupal 7 to Drupal 8

Were you using the Metatag field with the File Entity module on your D7 site? Are you using core media on D9 for the standalone file paths, or something else?

Yes we are using Metatag field with File Entity for our D7. And D9 we are using core media.

So, how can we migrate from D7 to D9 for Metatags of type image & video entities?

I suspect the issue might be that the entity type has changed between D7 and D9, so they aren't matching up during the process.

Out of interest, does the process recreate the Metatag field for the media types?

Yes we have configured metatags for Media type.

As per the code https://github.com/damienmckenna/metatag/blob/8.x-1.x/metatag.module#L694

I see it supported only for node, taxonomy & user but not file or Media.

Does this work, or even help?

The last submitted patch, 6: metatag-n3376077-6.patch, failed testing. View results →

(the test failure is a false negative)

Bumping to the v2 branch.

I wonder if this should map files to media objects automatically instead of assuming it would map to files?

Should this say $entity_type = 'media' instead of "file"?

+        // Files get migrated to media entities.
+        case 'file':
+          $entity_type = 'file';
+          $entity_id = $row->getSourceProperty('fid');
+          break;