> ## Documentation Index > Fetch the complete documentation index at: https://docs.axilio.ai/llms.txt > Use this file to discover all available pages before exploring further. # Register a file upload > Registers an image or video in the org's file library and returns a presigned S3 URL to upload the bytes to. PUT the raw file to upload_url with the declared Content-Type and Content-Length headers before the URL expires, then call the complete endpoint to make it ready. The registered file has source=upload. Uploads are capped per file and per org by total size. ## OpenAPI ````yaml /api-reference/openapi-backend.json post /files openapi: 3.1.0 info: description: Axilio backend HTTP API. title: Axilio API version: 0.85.0 servers: - url: https://api.axilio.ai/api/v1 description: Production security: [] tags: - name: API Keys - name: Billing - name: Files - name: Organization - name: Phones - name: Runs - name: Skill - name: Usage - name: Workflows paths: /files: post: tags: - Files summary: Register a file upload description: >- Registers an image or video in the org's file library and returns a presigned S3 URL to upload the bytes to. PUT the raw file to upload_url with the declared Content-Type and Content-Length headers before the URL expires, then call the complete endpoint to make it ready. The registered file has source=upload. Uploads are capped per file and per org by total size. operationId: files_create requestBody: content: application/json: schema: $ref: '#/components/schemas/FileCreateRequest' required: true responses: '201': content: application/json: schema: $ref: '#/components/schemas/FileUploadResponse' description: Created default: content: application/problem+json: schema: $ref: '#/components/schemas/V2ErrorModel' description: Error security: - apiKeyAuth: [] components: schemas: FileCreateRequest: additionalProperties: false description: Registers an upload and requests a presigned PUT URL. properties: filename: description: Display name for the file (also its name on the phone). maxLength: 255 minLength: 1 type: string mime_type: description: MIME type of the upload; must be an allowed image or video type. minLength: 1 type: string size_bytes: description: >- Exact size of the upload in bytes, up to 100 MiB (the phone-delivery ceiling); the presigned URL pins it. format: int64 maximum: 104857600 minimum: 1 type: integer required: - filename - mime_type - size_bytes type: object FileUploadResponse: additionalProperties: false description: The registered file and its presigned upload URL. properties: file: $ref: '#/components/schemas/FileSummary' description: The registered library entry. upload_expires_in_seconds: description: How long the upload URL stays valid. format: int64 type: integer upload_url: description: >- Presigned S3 PUT URL. PUT the raw file bytes to it with the declared Content-Type and Content-Length headers. type: string required: - file - upload_url - upload_expires_in_seconds type: object V2ErrorModel: additionalProperties: false description: >- Error response, following RFC 9457 (Problem Details for HTTP APIs). Returned with a application/problem+json content type. properties: detail: description: >- A human-readable explanation specific to this occurrence of the problem. examples: - Property foo is required but is missing. type: string errors: description: Optional list of individual error details items: $ref: '#/components/schemas/V2ErrorDetail' type: - array - 'null' instance: description: >- A URI reference that identifies the specific occurrence of the problem. examples: - https://example.com/error-log/abc123 format: uri type: string status: description: HTTP status code examples: - 400 format: int64 type: integer title: description: >- A short, human-readable summary of the problem type. This value should not change between occurrences of the error. examples: - Bad Request type: string type: default: about:blank description: A URI reference to human-readable documentation for the error. examples: - https://example.com/errors/example format: uri type: string type: object FileSummary: additionalProperties: false description: One file in the org's library. properties: attachment_url: description: >- Short-lived signed URL that downloads the file as an attachment under its name. Present only for ready files. type: string bytes_transferred: description: >- Bytes moved so far for an in-flight phone transfer. Absent until the phone reports progress. format: int64 type: integer capture_error: description: Reason the capture failed, when it did. Present only for captures. type: string capture_state: description: >- Capture lifecycle: detected/uploading while in flight, ready when usable, or a terminal skip/failure with its reason. Present only for captures. enum: - detected - uploading - ready - skipped_size - skipped_quota - skipped_type - dropped_teardown - failed type: string checksum: description: >- SHA-256 of the bytes, computed on the phone during a capture upload. Present only for captures. type: string created_at: description: >- When the file was registered: upload registration, or capture detection. format: date-time type: string download_url: description: >- Short-lived signed URL to read the file's bytes. Present only for ready files; re-list to refresh an expired one. type: string duration_seconds: description: Video duration in seconds. format: int64 type: integer filename: description: >- Original filename; used as the display name when the file lands on a phone. type: string height: description: Intrinsic pixel height of the source. format: int64 type: integer id: description: >- File identifier. Unique across the whole library; deliverable to a phone regardless of source. type: string mime_type: description: Declared MIME type, pinned by the presigned upload. type: string on_phone_count: description: >- Distinct phones currently holding or receiving a copy. Deleting the file recalls these. format: int64 type: integer preview_state: description: >- Whether the preview exists, is still being generated, or will never be available for this format. enum: - processing - ready - unavailable type: string reel_url: description: >- Short-lived signed URL for the animated hover preview. Videos only; absent until generated. type: string session_id: description: Session that produced the file. Present only for captures. type: string size_bytes: description: Declared size in bytes, pinned by the presigned upload. format: int64 type: integer source: description: >- How the file entered the library: upload (put in directly) or capture (lifted off a session). enum: - upload - capture type: string status: description: >- uploading until the object is verified in storage, then ready. For a capture, read capture_state for the fuller lifecycle. enum: - uploading - ready type: string surface: description: >- Which surface a capture came off (phone today). Absent for a direct upload. enum: - phone type: string thumbnail_url: description: >- Short-lived signed URL for the generated preview image. Absent while generation is pending, and permanently absent for formats without a preview. type: string width: description: Intrinsic pixel width of the source. format: int64 type: integer required: - id - source - filename - mime_type - size_bytes - status - created_at - on_phone_count - preview_state type: object V2ErrorDetail: additionalProperties: false description: >- One specific problem within an error response, locating the offending part of the request. properties: location: description: >- Where the error occurred, e.g. 'body.items[3].tags' or 'path.thing-id' type: string message: description: Error message text type: string value: description: The value at the given location type: object securitySchemes: apiKeyAuth: description: Customer API key (axl_ prefix). in: header name: X-Axilio-Api-Key type: apiKey ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.