Tangible User Interfaces (hereafter, TUIs) are novel forms of human-computer interactions based on the physical manipulation of any kind of object/artifact. A great potential of TUIs technologies is the possibility to personalize objects and interaction between the user and the system. The high level of platform flexibility allows, for example, a multisensory approach, that is crucial for children that have sensory limitations and disabilities. This contribution aims at presenting and discussing the development of an authoring tool for creating TUI-supported activities for inclusive digital storytelling. The authoring tool is a product of collaboration and consultation with researchers and teachers involved in the ERASMUS+ project I’M IN TALES. A preliminary usability validation study using a mixed-method approach has been conducted involving 50 educators and assistive technology professionals. The results indicate an overall acceptance of the system. The feedback provided by the participants involved will be used for the future refinement of the tool.