Mooling0602/dsh-web-file-uploader

This is a native plugin built exclusively for the DeepSeek Harness web user interface. It adds a custom paperclip-styled attachment button directly to the right of DSH’s official attachment button in the composer toolbar, with optional settings to hide the original button and use this plugin’s button instead. It supports multi-file selection, renders uploaded files as preview cards with image thumbnails in the dock above the composer, and stores all uploaded files on the DSH host machine rather than only in the user’s browser. It also handles file name sanitization for invalid characters and automatically appends collision suffixes for new files with duplicate names.

The plugin uses a card-driven injection design, so any file with an open card will have its absolute host path injected into every outgoing user message. Closing a card stops injection but leaves the file intact on the host for later access by the model, while deleting a card permanently removes the file from the host (if no other active references to the deduplicated copy exist). The plugin automatically adapts injection behavior based on the model’s capabilities: for multimodal models, images are injected as native ImageBlocks, while for text-only models and all non-image files, only the file path is injected into the prompt.

The plugin is released under the permissive MIT open source license, and uses content-addressed deduplication to avoid wasting storage space on repeated uploads. All UI text is automatically localized to match DSH’s existing language setting, with support for both English and Simplified Chinese. The project follows a core-logic-plus-thin-adapter architecture, and the dynamic plugin mode is already fully implemented and verified in live DSH sessions. The static bundle build works but still requires additional verification of its compatibility with DSH’s web module loader. Storage location varies by build mode, going to either the session workspace or DSH’s home data directory.