UI Single Export/Import of files

You have to make sure that the folder in this path $app_root.'/content/sync' is writable.
When adding it on setting.php, you have to create it and make it writable.

About the files, there is a drush option that handle how the file is exported.
https://www.drupal.org/docs/8/modules/content-synchronization/drush-comm... →

--files
A value option to export media/files.
Values: none, base64, folder

none: means not file is moved, only the content configuration yml file
base64: put the data of the file on the yml file so it can be imported
folder: move the file to the content/config folder

example:
ddev drush content-sync:export --entity-types=file --files=base64

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I'm updating the title of this Issue, to reflect that the UI of exporting/importing a file needs to have the options that drush have.

Closing this task as it is a duplicate of:
https://www.drupal.org/project/content_sync/issues/3232551#comment-15788438 🐛 Images are not synchronized in Single item synchronisation, but the images files details are in yml files Active