docs: fix links + add file upload sections to all language versions

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/ko/concepts/files.mdx

@@ -134,6 +134,10 @@ result = flow.kickoff(
 )
 ```
 
+<Note type="info" title="CrewAI Platform Integration">
+When deployed on CrewAI Platform, `ImageFile`, `PDFFile`, and other file-typed fields in your flow state automatically get a file upload UI. Users can drag and drop files directly in the Platform interface. Files are stored securely and passed to agents using provider-specific optimizations (inline base64, file upload APIs, or URL references depending on the provider). For API usage examples, see [File Inputs in Flows](/concepts/flows#file-inputs).
+</Note>
+
 ### 단독 에이전트와 함께
 
 에이전트 킥오프에 직접 파일을 전달합니다:

docs/ko/concepts/flows.mdx

@@ -334,6 +334,89 @@ flow.kickoff()
 
 CrewAI Flows는 비구조적 및 구조적 상태 관리 옵션을 모두 제공함으로써, 개발자들이 다양한 애플리케이션 요구 사항에 맞춰 유연하면서도 견고한 AI 워크플로를 구축할 수 있도록 지원합니다.
 
+### File Inputs
+
+When using structured state, you can include file-typed fields using classes from `crewai-files`. This enables file uploads as part of your flow's input:
+
+```python
+from crewai.flow.flow import Flow, start
+from crewai_files import ImageFile, PDFFile
+from pydantic import BaseModel
+
+class OnboardingState(BaseModel):
+    document: PDFFile        # File upload
+    cover_image: ImageFile   # Image upload
+    title: str = ""          # Text input
+
+class OnboardingFlow(Flow[OnboardingState]):
+    @start()
+    def process_upload(self):
+        # Access files directly from state
+        print(f"Processing: {self.state.title}")
+        return self.state.document
+```
+
+When deployed on **CrewAI Platform**, file-typed fields automatically render as file upload dropzones in the UI. Users can drag and drop files, which are then passed to your flow.
+
+**Kicking off with files via API:**
+
+The `/kickoff` endpoint auto-detects the request format:
+- **JSON body** → normal kickoff
+- **multipart/form-data** → file upload + kickoff
+
+API users can also pass URL strings directly to file-typed fields—Pydantic coerces them automatically.
+
+### API Usage
+
+#### Option 1: Multipart kickoff (recommended)
+
+Send files directly with the kickoff request:
+
+```bash
+# With files (multipart) — same endpoint
+curl -X POST https://your-deployment.crewai.com/kickoff \
+  -H 'Authorization: Bearer YOUR_TOKEN' \
+  -F 'inputs={"company_name": "Einstein"}' \
+  -F 'cover_image=@/path/to/photo.jpg'
+```
+
+Files are automatically stored and converted to `FileInput` objects. The agent receives the file with provider-specific optimization (inline base64, file upload API, or URL reference depending on the LLM provider).
+
+#### Option 2: JSON kickoff (no files)
+
+```bash
+# Without files (JSON) — same endpoint
+curl -X POST https://your-deployment.crewai.com/kickoff \
+  -H 'Authorization: Bearer YOUR_TOKEN' \
+  -H 'Content-Type: application/json' \
+  -d '{"inputs": {"company_name": "Einstein"}}'
+```
+
+#### Option 3: Separate upload + kickoff
+
+This is an alternative to multipart upload when you need to upload files separately from the kickoff request. Upload files first, then reference them by URL:
+
+```bash
+# Step 1: Upload
+curl -X POST https://your-deployment.crewai.com/files \
+  -H 'Authorization: Bearer YOUR_TOKEN' \
+  -F 'file=@/path/to/photo.jpg' \
+  -F 'field_name=cover_image'
+# Returns: {"url": "https://...", "field_name": "cover_image"}
+
+# Step 2: Kickoff with URL
+curl -X POST https://your-deployment.crewai.com/kickoff \
+  -H 'Authorization: Bearer YOUR_TOKEN' \
+  -H 'Content-Type: application/json' \
+  -d '{"inputs": {"company_name": "Einstein"}, "input_files": {"cover_image": "https://..."}}'
+```
+
+See the Platform API documentation for full `/files` endpoint details.
+
+#### On CrewAI Platform
+
+When using the Platform UI, file-typed fields automatically render as drag-and-drop upload zones. No API calls needed—just drop the file and click Run.
+
 ## 플로우 지속성
 
 @persist 데코레이터는 CrewAI 플로우에서 자동 상태 지속성을 활성화하여, 플로우 상태를 재시작이나 다른 워크플로우 실행 간에도 유지할 수 있도록 합니다. 이 데코레이터는 클래스 수준이나 메서드 수준 모두에 적용할 수 있어, 상태 지속성을 관리하는 데 유연성을 제공합니다.