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## Description This implementation adds support for the `media_name` parameter for WhatsApp document templates, resolving the issue where documents appear as "untitled" when sent via templates. **Problem solved:** Documents sent via WhatsApp templates always appeared as "untitled" because Chatwoot didn't process the `filename` field required by the WhatsApp API. **Solution:** Added support for the `media_name` parameter that maps to the WhatsApp API's `filename` field. ## Type of change - [x] New feature (non-breaking change which adds functionality) - [x] This change requires a documentation update ## How Has This Been Tested? Created and executed **7 comprehensive test scenarios**: 1. ✅ Document without `media_name` (backward compatibility) 2. ✅ Document with valid `media_name` 3. ✅ Document with blank `media_name` 4. ✅ Document with null `media_name` 5. ✅ Image with `media_name` (ignored as expected) 6. ✅ Video with `media_name` (ignored as expected) 7. ✅ Blank URL (returns nil appropriately) **All tests passed** and confirmed **100% backward compatibility**. ## Technical Implementation **Backend Changes:** - `PopulateTemplateParametersService`: Added `media_name` parameter support - `TemplateProcessorService`: Pass `media_name` to parameter builder - `WhatsappCloudService`: Updated documentation with `media_name` example **Frontend Changes:** - `WhatsAppTemplateParser.vue`: Added UI field for document filename input - `templateHelper.js`: Include `media_name` for document templates - `whatsappTemplates.json`: Added translation key for document name placeholder **Key Features:** - 🔄 **100% Backward Compatible** - Existing templates continue working - 📝 **Document Filename Support** - Users can specify custom filenames - 🎯 **Document-Only Feature** - Only affects document media types - ✅ **Comprehensive Testing** - All edge cases covered ## Expected Behavior **Before:** ```ruby # All documents appear as "untitled" { type: 'document', document: { link: 'https://example.com/document.pdf' } } ``` **After:** ```ruby # With media_name - displays custom filename { type: 'document', document: { link: 'https://example.com/document.pdf', filename: 'Invoice_2025.pdf' } } # Without media_name - works as before { type: 'document', document: { link: 'https://example.com/document.pdf' } } ``` ## Checklist: - [x] My code follows the style guidelines of this project - [x] I have performed a self-review of my code - [x] I have commented on my code, particularly in hard-to-understand areas - [x] I have made corresponding changes to the documentation - [x] My changes generate no new warnings - [x] I have added tests that prove my fix is effective or that my feature works - [x] New and existing unit tests pass locally with my changes - [x] Any dependent changes have been merged and published in downstream modules Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>