This library requires SDK >= 24 for Compatibility. It acts as a normal <View /> on SDK < 24
If you want to drag and drop across different apps, you'll need to have both apps open in multi-window mode. Here is a link to the official documentation.
Dropping multiple media files is fully supported. However, for dragging, it is only available across different instances of <DragDropContentView />. For external dragging (to other websites or the desktop), you must pass only a single media file to the draggableSources.
The dropped files will not have uri or path properties. You can use base64 or text properties to get the file content.