You should build a visual element that will use this Plugins options to interact with the user. Then, place the File Uploader element in the page, it could be inside the widget you’ve crested. For example:
Then, start a workflow from it and search for Upload File&Multifile. In this action you should be able to set some variables. It could also be set directly in the editor.
I have already done this.
But currently I have to save the uploaded files to database.
There is an action called “save a File&Multifile” but am not sure how does it work.