TYPO3 Core

When using the f:form.upload ViewHelper to upload for a property of a DTO or domain model, it is not possible to upload multiple files, because the trusted properties are registered wrong. This results in the following extbase property mapping exception:

Exception while property mapping at property path "files": It is not allowed to map property "0". You need to use $propertyMappingConfiguration->allowProperties('0') to enable mapping of this property.

If the ViewHelper is configured to handle multiple files for upload, the filedname for the registerFieldNameForFormTokenGeneration must be calculated to allow multiple files.