Files in an embeddable AI chat: two buttons, a presigned URL, and a malware scanner

Most "AI chat" widgets do one thing: you type, it answers. Attachments are an afterthought — a paperclip that dumps a file somewhere and shows a thumbnail. When we added files to FodyChat , the interesting problems turned out to be almost nothing to do with the AI. They were about who the file is for , where it lives , and how big it is allowed to be . Two buttons, not one A file upload usually…