Dropzone uploadMultiple: true error fix #1062
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When you set Dropzone.options.uploadForm.uploadMultiple : true in config of an instance of dropzone 5.7.2 the request is created by dropzone creates multidimensional input of the upload like below;
upload[][0]: (binary)
upload[][1]: (binary)
upload[][2]: (binary)
When you send this request it is trying to validate this array values which is already array in UniSharp\LaravelFilemanager::uploadValidator() but it is not a instance of UploadedFile it is instance of array. So with flatting this array we convert request array to a single dimension array like below;
upload[0]: (binary)
upload[1]: (binary)
upload[2]: (binary)
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