# recording.appendAudioChunk
mutation write
Use when the requested change exactly matches recording.appendAudioChunk; read the current state first when a version or identifier may have changed.
## Before calling
- Authenticate as the accountable Enhance person.
- Use only resource identifiers returned by an earlier capability result or supplied by the person.
- Reuse clientToken only when retrying this exact mutation input.
## Input
Show complete JSON Schema
```json
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"recordingId": {
"type": "string",
"format": "uuid",
"pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$"
},
"index": {
"type": "integer",
"minimum": 0,
"maximum": 9007199254740991
},
"firstMs": {
"type": "integer",
"minimum": 0,
"maximum": 9007199254740991
},
"lastMs": {
"type": "integer",
"minimum": 0,
"maximum": 9007199254740991
},
"bytes": {
"type": "integer",
"minimum": 1,
"maximum": 16777216
},
"epoch": {
"default": 0,
"type": "integer",
"minimum": 0,
"maximum": 9007199254740991
},
"startsEpoch": {
"default": false,
"type": "boolean"
},
"etag": {
"type": "string",
"minLength": 1,
"maxLength": 200
}
},
"required": [
"recordingId",
"index",
"firstMs",
"lastMs",
"bytes",
"epoch",
"startsEpoch"
],
"additionalProperties": false
}
```
### Example
Show example input
```json
{
"recordingId": "00000000-0000-4000-8000-000000000010",
"index": 0,
"firstMs": 0,
"lastMs": 0,
"bytes": 1,
"epoch": 0,
"startsEpoch": false
}
```
## Result
Returns a typed recording.appendAudioChunk result from the Enhance API without transport-specific prose.
## Recovery
- BAD_REQUEST: correct the named fields and call again.
- UNAUTHORIZED: restore Enhance authentication, then retry once.
- FORBIDDEN or NOT_FOUND: list accessible resources and choose an allowed identifier.
- CONFLICT: read the current resource, merge the intended change, and retry with its version.
- INTERNAL: run Enhance diagnostics, report the failure, and stop repeating the call.
## Continue with
- Read the affected recording resource to confirm the result.
Compatibility: `0d535e6f36d2b117c1c232f4edca1e08c2c81d1923a905fcee1ccef05b51c78f`.