Support "multiple" attribute

[M-arcus]

Using the multiple attribute for the input leads to an exception:

Core: Exception handler (WEB): Uncaught TYPO3 Exception: Call to a member function _isNew() on null | Error thrown in file /.../typo3_src-7.6.16/typo3/sysext/extbase/Classes/Persistence/Generic/Backend.php in line 484.

On TYPO3 7.6.16

[helhum]

Thanks for your report

The multiple attribute is not yet supported by this example

[M-arcus]

There is an error in the TYPO3\CMS\Extbase\Property\PropertyMapper too, because it tries to map the file-array, that has multiple items.

[helhum]

as I said multiple is not supported by this example ^^

[roel018]

Bumping this one... Support for and understanding of uploading multiple files at once to an imageCollection instance would be awesome. I can't figure it out myself...