Import Error from file

Problem/Motivation

Error when trying to restore Block Layout from a downloaded json file

Steps to reproduce

Export Block layout to a file - then import the same file

"PHP message: Uncaught PHP Exception TypeError: "Cannot access offset of type array in isset or empty" at /mnt/www/drupal10/web/core/modules/file/file.module line 626" while reading response header from upstream, client: 194.233.99.132, server: www.indydailyreporter.com, request: "POST /admin/config/restore_process/newsplus9?element_parents=block_restore/json_file&ajax_form=1&_wrapper_format=drupal_ajax HTTP/2.0", upstream: "fastcgi://10.142.0.27:9003", host: "www.indydailyreporter.com"

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes