> ## Documentation Index > Fetch the complete documentation index at: https://docs.apsio.io/llms.txt > Use this file to discover all available pages before exploring further. # Missing symbols of a release > The in-app images that events of this release referenced and for which no debug file was uploaded to the project: an Apple binary without its dSYM (upload with `apsio upload dsyms`), an Android build whose stack shows R8 names without its mapping (`apsio upload mappings`), an Android native library without its debug file (`apsio upload ndk`), or a React Native bundle without its source map (`apsio upload sourcemaps`). Affected issues are symbolicated again when the file arrives. ## OpenAPI ````yaml /api-reference/openapi.json get /projects/{projectId}/releases/{release}/missing-symbols openapi: 3.1.0 info: title: Apsio API version: 0.1.0 description: >- Read API v0: your projects, release health and comparisons, missing symbols, issues, sessions, vitals, cohort comparisons, performance (app start, screens, hangs, MetricKit) and network endpoints and traces for one project. Authenticate with a project token as a bearer token, with an OAuth access token from Apsio's authorization server (MCP clients), or, from the console, with the session cookie of a member of the project's organization. servers: - url: https://api.apsio.io/v1 security: [] paths: /projects/{projectId}/releases/{release}/missing-symbols: get: summary: Missing symbols of a release description: >- The in-app images that events of this release referenced and for which no debug file was uploaded to the project: an Apple binary without its dSYM (upload with `apsio upload dsyms`), an Android build whose stack shows R8 names without its mapping (`apsio upload mappings`), an Android native library without its debug file (`apsio upload ndk`), or a React Native bundle without its source map (`apsio upload sourcemaps`). Affected issues are symbolicated again when the file arrives. parameters: - schema: type: string pattern: ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$ example: 0192f3a4-0000-7000-8000-00000000a101 required: true name: projectId in: path - schema: type: string minLength: 1 maxLength: 128 description: service.version required: true description: service.version name: release in: path - schema: type: integer minimum: 1 maximum: 1000 default: 100 description: Page size, 1 to 1000. example: 100 required: false description: Page size, 1 to 1000. name: limit in: query - schema: type: string maxLength: 1024 description: The `next_cursor` of the previous page. Opaque. required: false description: The `next_cursor` of the previous page. Opaque. name: cursor in: query - schema: type: string pattern: ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$ description: Only this app. required: false description: Only this app. name: app_id in: query responses: '200': description: The images without symbols, by app, build and debug id. content: application/json: schema: type: object properties: release: type: string images: type: integer description: >- In-app images the release referenced, with or without symbols. missing_symbols: type: array items: $ref: '#/components/schemas/MissingSymbols' next_cursor: type: - string - 'null' description: >- Pass as `cursor` to get the next page; null on the last page. required: - release - images - missing_symbols - next_cursor '400': description: The request is not valid. content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: No valid bearer token or console session. content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: The credentials cannot read this project. content: application/json: schema: $ref: '#/components/schemas/Error' security: - bearer: [] - session: [] components: schemas: MissingSymbols: type: object properties: app_id: type: string build: type: string description: app.build_id debug_id: type: string example: 8124c1a2-6e0b-3f51-9d57-1b2e7c4a9b07 description: >- The image's debug id: a Mach-O UUID, an Android build id (R8 mapping), the debug id of an NDK library's GNU build id, or a React Native source map's map id. image_name: type: string description: >- The binary, the Android package (mapping), the library file name (NDK) or the JS bundle file name (React Native, with @ for an over-the-air bundle). arch: type: string last_seen: type: string description: When an event last referenced the image. example: '2026-10-04T10:15:00.431000000Z' required: - app_id - build - debug_id - image_name - arch - last_seen Error: type: object properties: error: type: object properties: code: type: string example: invalid_request message: type: string required: - code - message required: - error securitySchemes: bearer: type: http scheme: bearer description: >- A project token (apsio_pt_v0...), which reads exactly one project, or an OAuth access token issued for the API, which reads what its user can. Access tokens issued for Apsio's MCP server are accepted only from the MCP server itself. session: type: apiKey in: cookie name: apsio_session description: >- The console session, set by /v1/auth/callback (`__Host-apsio_session` when host-only). ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.