I've seen a couple of posts in this forum that are somewhat related to users wanting to set up a custom upload form which requires users set metadata (column values) before an upload is permitted. I have created such a form (inside & outside SP chrome) using the SP REST API and have given the URL to that form.
Lead user wants all the views of the list to divert to this URL whenever there is any file upload (drag-n-drop, use of Upload function in modern experience) action/event taken. This is probably do-able using JSLink in classic experience, but we are moving completely towards the modern experience. Does anyone have advice to offer as to what customization in SPFx I should be looking at?