When dragging images from a web browser into a PyQt6 application, `toLocalFile()` can return an empty string because browsers may provide remote HTTP URLs, raw image data, or HTML fragments instead of local file paths. The fix involves handling all four cases in the drop event: local file URLs, remote URLs (downloaded via urllib), raw image data via `hasImage()`, and HTML `<img>` tags parsed with regex. A complete working rich text editor example is provided that overrides `insertFromMimeData` to handle all these scenarios, including data URIs, and works consistently across Chrome, Firefox, and Edge.
Table of contents
How drag and drop MIME data worksWhy toLocalFile() returns an empty stringInspecting what the browser actually sendsHandling all cases in your drop eventComplete working exampleWhat's happening in the complete example70 Impressions