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MediaSeg is a macOS tool that splits large media files into upload-ready chunks.
Extend UI is an open-source UI kit for modern document apps, providing viewers for PDF, DOCX, XLSX, and CSV files, along with features like bounding box citations, file upload, and e-signing.
OpenAI Academy provides a guide on how to upload and work with files in ChatGPT, covering supported formats, prompting examples, and third-party app integrations.