File upoload stucks

This item has been reported before, but no solution was published. When editing or creating a record with a file upload field, the field kept showing a loading text.

My wqebhost noticed a activation of their URL-injection protection. The solution offered was to rename themes/ee/asset/javascript/compressed/fields/file/file_field_drag_and_drop.js and remove the drop in the name. Secondly, this new name is entered in system/ee/legacy/libraries/File_field.php on line 227

The solution worked fine for me.