A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Hi Harry,
Thanks for posting in the community.
For your concern, I am afraid there is no built-in feature that can help you to drag files to a SharePoint list and upload them as attachments.
In the meanwhile, some members mentioned using REST API may meet your requirement. If you are interested in it, since we have a specific channel Q&A Community coping with such REST service, I would like to suggest you post a new thread there for expert help.
For your thread: Drag & Drop Attachment to List
Appreciate your understanding and patience.
Regards,
George