Closes #13277 ## What I Did - Enabled `multiple` attribute in the file input - Updated the `handleFileChange` handler to loop through files - Confirmed that each file is sent via `uploadAttachmentFile` ## Why This change allows users to upload multiple files at once instead of doing it one by one. ## Screenshot / Video (Optional) [Screencast From 2025-07-18 23-58-36.webm](https://github.com/user-attachments/assets/ea191f25-1904-4643-afe2-7029785eebcb) --- Let me know if you'd like any changes! 💪 --------- Co-authored-by: Félix Malfait <felix@twenty.com>