> ## Documentation Index
> Fetch the complete documentation index at: https://isol8.notdhruv.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Upload file

> Upload base64-encoded file content into an active persistent session.

Uploads a file into a persistent session container.

<ParamField body="sessionId" type="string" required>
  Existing persistent session identifier.
</ParamField>

<ParamField body="path" type="string" required>
  Absolute target path inside the container.
</ParamField>

<ParamField body="content" type="string" required>
  Base64-encoded file content.
</ParamField>

<ResponseField name="ok" type="boolean">
  `true` when upload succeeds.
</ResponseField>

<RequestExample>
  ```bash theme={null}
  curl -X POST http://localhost:3000/file \
    -H "Authorization: Bearer $ISOL8_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{
      "sessionId": "session-123",
      "path": "/sandbox/input.txt",
      "content": "aGVsbG8K"
    }'
  ```
</RequestExample>

<ResponseExample>
  ```json theme={null}
  { "ok": true }
  ```
</ResponseExample>