When you generate a migration file with data migration, source for Image Fields is provided in the following way:

            value:
                id: 7/0/3/0/307-1-eng-GB/vergongeat_full.jpg
                path: 7/0/3/0/307-1-eng-GB/vergongeat_full.jpg
...

When you import a file like this with ibexa:migrations:migrate, the images are not imported correctly.

What is necessary to import an image correctly is:
1. Modify the migration file so the id points to the file name directly:

            value:
                id: vergongeat_full.jpg
                path: 7/0/3/0/307-1-eng-GB/vergongeat_full.jpg
...

2. Place image files in public/var/site/storage/images