I use filepicker.io to handle upload. But I want the user to provide additional data related to the uploaded file, so basically I would need to add to the modal some comboboxes and text inputs. Is it possible by using the widget approach with the filepicker.constructWidget call?
Fliepicker.io - How to add fields to the widgets modal dialog?
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I'm afraid it's not possible, constructWidget only accepts addition options listed here https://www.filepicker.com/documentation/file_ingestion/widgets/programming?v=v1 and a type which can be 'filepicker' or 'filepicker-dragdrop'. You would need to try a different approach i.e. add the text inputs after the modal is called and files uploaded.