Submit Attachments (Docs Alias)

Documentation-friendly alias for submitting base64-encoded attachments.

Backend path: /services/data/v54.0/sobjects/Attachment. Attachments must be transmitted to the Attachment endpoint (separate from application create/update).

Request Body

Content type: application/json

Required2 fields

Opportunityobject

attachmentsarray<object>

minItems=1

Validations (2)

attachments

minItems=1

attachments[].Body

format=byte

Responses

201

Attachments created successfully

Common2 fields

idstring

Id of the created record

successboolean

When Provided1 field

errorsarray<string>

Example response

id: 00P1800000ABCdEAAW
success: true
errors: []

400

Bad request (e.g., file too large, missing Opportunity ID)

Attachment Requirements

Opportunity ID is required
File size limit: 100 MB per file
Maximum total attachment size: 2 GB
Files must be converted to Base64

Code samples

Copy-paste ready code in your preferred language.

API call

Copy/paste friendly

curl -X POST "https://test.salesforce.com/applications/attachments" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
  -d '{
  "Opportunity": {
    "Id": "YOUR_OPPORTUNITY_ID"
  },
  "attachments": [
    {
      "Body": "BASE64_ENCODED_FILE",
      "ContentType": "text/plain",
      "Name": "example.txt"
    }
  ]
}'