--- title: POST /assets/{asset_id}/versions slug: content-marketing-platform/api/post-assetsassetidversions docTags: createdAt: 2026-10-01T18:51:28.134Z --- { "id": "cp3id262KBR1m_LfNJhJm", "type": "api-oas-v2", "data": { "method": "POST", "url": "https://api.cmp.optimizely.com/v3/assets/{asset_id}/versions", "servers": [ { "url": "https://api.cmp.optimizely.com/v3/assets/{asset_id}/versions", "description": "v3 version of Optimizely CMP Open API" } ], "name": "POST /assets/{asset_id}/versions", "description": "

Add a new version to a library asset. Supports adding versions to only images, videos, and raw files type assets. See Upload assets to upload a version to a library asset.

", "contentType": "application/json", "request": { "pathParameters": [ { "kind": "required", "name": "asset_id", "type": "string", "example": "5d7f910551b00a722e0418830cee6631", "description": "Unique identifier of the asset" } ], "headerParameters": [ { "name": "accept", "type": "string", "kind": "optional", "description": "Generated from available response content types", "enum": [ "application/json" ], "default": "application/json" } ], "queryParameters": [], "bodyDataParameters": [ { "kind": "required", "name": "body", "type": "object", "description": "Payload to add a version to a library asset", "customType": "AssetVersionCreateRequest", "schema": [ { "name": "key", "kind": "required", "type": "string", "description": "

Unique identifier of the file upload session. This is the upload_meta_fields.key field retrieved from the /v3/upload-url endpoint.

", "maxLength": 100 }, { "name": "title", "kind": "required", "type": "string", "description": "Title of the asset", "example": "sample_image.png", "minLength": 1, "maxLength": 100 } ], "modelRef": "#/components/schemas/AssetVersionCreateRequest", "isExpanded": true } ], "formDataParameters": [], "oAuthParameters": [ { "id": "OAuth2", "name": "OAuth2", "kind": "optional", "type": "oauth2", "oauth2Flows": { "clientCredentials": { "tokenUrl": "https://accounts.cmp.optimizely.com/o/oauth2/v1/token", "scopes": {} }, "authorizationCode": { "authorizationUrl": "https://accounts.cmp.optimizely.com/o/oauth2/v1/auth", "tokenUrl": "https://accounts.cmp.optimizely.com/o/oauth2/v1/token", "scopes": { "openid": "Grants the ability to receive a unique identifier for the user.", "profile": "Grants access to user profile information.", "offline_access": "Grants the ability to refresh access_token using the refresh token even when user is not present (not logged in)." } } }, "requiredScopes": [ "openid", "profile", "offline_access" ] } ], "cookieParameters": [] }, "responses": [ { "statusCode": "201", "description": "Created version", "jsonExample": "", "isExpanded": true, "schema": [ { "kind": "optional", "type": "object", "description": "", "customType": "LibraryAssetVersionResponse", "schema": [ { "name": "version_number", "kind": "required", "type": "integer", "description": "The serial number of the version", "example": 2 }, { "name": "asset_id", "kind": "required", "type": "string", "description": "Unique identifier of the asset", "example": "5d7f910551b00a722e0418830cee6631" }, { "name": "title", "kind": "required", "type": "string", "description": "Title of the asset", "example": "sample_image.png" }, { "name": "type", "kind": "required", "type": "string", "description": "Type of the version", "example": "image", "enum": [ "image", "video", "raw_file" ] }, { "name": "mime_type", "kind": "required", "type": "string", "description": "MIME type of the version", "example": "image/png" }, { "name": "created_at", "kind": "required", "type": "string", "description": "

Date and time on which the version was created, in ISO 8601 UTC format (2020-02-10T10:40

)

", "example": "2019-10-06T13:15:30Z", "format": "date-time" }, { "name": "content", "kind": "required", "type": "object", "description": "Content of the version", "example": "", "schema": [ { "name": "type", "kind": "required", "type": "string", "description": "Type of the content", "example": "url", "enum": [ "url" ] }, { "name": "value", "kind": "required", "type": "string", "description": "

Content of the version. It is the download URL for image, raw file, and video.

", "example": "http://images.cmp.optimizely.com/Zz0xODQ3NDU3Y2Y2YmYzOTlmNjkyOTgyZDY3Y2I3YWM2OA==S" } ] }, { "name": "links", "kind": "required", "type": "object", "description": "Meta links", "example": "", "schema": [ { "name": "asset", "kind": "required", "type": "string", "description": "URL of the asset that the version is associated with", "example": "https://api.cmp.optimizely.com/v3/images/5d7f910551b00a722e0418830cee6631" } ] } ], "modelRef": "#/components/schemas/LibraryAssetVersionResponse", "isExpanded": true } ] }, { "statusCode": "400", "description": "Client error", "jsonExample": "", "isExpanded": true, "schema": [ { "kind": "optional", "type": "object", "example": "{\"message\":\"Unsupported arguments: a,b,c\"}", "description": "Error payload", "customType": "Error", "schema": [ { "name": "message", "kind": "required", "type": "string", "description": "Message describing the error", "example": "Not found" }, { "name": "errors", "kind": "optional", "type": "map", "description": "Additional information", "example": "", "customType": "map", "schema": [] } ], "modelRef": "#/components/schemas/Error", "isExpanded": true } ] }, { "statusCode": "401", "description": "Authorization error", "jsonExample": "", "isExpanded": true, "schema": [ { "kind": "optional", "type": "object", "example": "{\"message\":\"Unauthorized\"}", "description": "Error payload", "customType": "Error", "schema": [ { "name": "message", "kind": "required", "type": "string", "description": "Message describing the error", "example": "Not found" }, { "name": "errors", "kind": "optional", "type": "map", "description": "Additional information", "example": "", "customType": "map", "schema": [] } ], "modelRef": "#/components/schemas/Error", "isExpanded": true } ] }, { "statusCode": "403", "description": "Permission error", "jsonExample": "", "isExpanded": true, "schema": [ { "kind": "optional", "type": "object", "example": "{\"message\":\"You do not have the permission to perform this operation\"}", "description": "Error payload", "customType": "Error", "schema": [ { "name": "message", "kind": "required", "type": "string", "description": "Message describing the error", "example": "Not found" }, { "name": "errors", "kind": "optional", "type": "map", "description": "Additional information", "example": "", "customType": "map", "schema": [] } ], "modelRef": "#/components/schemas/Error", "isExpanded": true } ] }, { "statusCode": "404", "description": "Not found error", "jsonExample": "", "isExpanded": true, "schema": [ { "kind": "optional", "type": "object", "example": "{\"message\":\"Resource not found\"}", "description": "Error payload", "customType": "Error", "schema": [ { "name": "message", "kind": "required", "type": "string", "description": "Message describing the error", "example": "Not found" }, { "name": "errors", "kind": "optional", "type": "map", "description": "Additional information", "example": "", "customType": "map", "schema": [] } ], "modelRef": "#/components/schemas/Error", "isExpanded": true } ] }, { "statusCode": "422", "description": "Unprocessable entity error", "jsonExample": "", "isExpanded": true, "schema": [ { "kind": "optional", "type": "object", "example": "{\"message\":\"Resource cannot be processed\"}", "description": "Error payload", "customType": "Error", "schema": [ { "name": "message", "kind": "required", "type": "string", "description": "Message describing the error", "example": "Not found" }, { "name": "errors", "kind": "optional", "type": "map", "description": "Additional information", "example": "", "customType": "map", "schema": [] } ], "modelRef": "#/components/schemas/Error", "isExpanded": true } ] } ], "hasXCodeSamples": false, "examples": { "languages": [ { "id": "HM8g4CUNahctdQf39wbvC", "language": "curl", "label": "cURL", "code": "curl --request POST \\\n --url https://api.cmp.optimizely.com/v3/assets/{asset_id}/versions \\\n --header 'accept: application/json' \\\n --header 'content-type: application/json' \\\n --data '{\n \"key\": \"\",\n \"title\": \"sample_image.png\"\n }'" }, { "id": "JleIklb3tuQsQU3cAVtFx", "language": "javascript", "label": "javascript", "code": "var myHeaders = new Headers();\nmyHeaders.append(\"accept\", \"application/json\");\nmyHeaders.append(\"content-type\", \"application/json\");\n\nvar raw = JSON.stringify({\n \"key\": \"\",\n \"title\": \"sample_image.png\"\n});\n\nvar requestOptions = {\n method: 'POST',\n headers: myHeaders,\n body: raw,\n redirect: 'follow'\n};\n\nfetch(\"https://api.cmp.optimizely.com/v3/assets/{asset_id}/versions\", requestOptions)\n .then(response => response.text())\n .then(result => console.log(result))\n .catch(error => console.log('error', error));" }, { "id": "jjQHDay2L1s_1KVzvznfq", "language": "ruby", "label": "Ruby", "code": "require \"uri\"\nrequire \"json\"\nrequire \"net/http\"\n\nurl = URI(\"https://api.cmp.optimizely.com/v3/assets/{asset_id}/versions\")\n\nhttps = Net::HTTP.new(url.host, url.port)\nhttps.use_ssl = true\n\nrequest = Net::HTTP::Post.new(url)\nrequest[\"accept\"] = \"application/json\"\nrequest[\"content-type\"] = \"application/json\"\nrequest.body = JSON.dump({\n \"key\": \"\",\n \"title\": \"sample_image.png\"\n})\n\nresponse = https.request(request)\nputs response.read_body\n" }, { "id": "9_QpflfXOvzo-Gn5DHa8e", "language": "python", "label": "Python", "code": "import requests\nimport json\n\nurl = \"https://api.cmp.optimizely.com/v3/assets/{asset_id}/versions\"\n\npayload = json.dumps({\n \"key\": \"\",\n \"title\": \"sample_image.png\"\n})\nheaders = {\n 'accept': 'application/json',\n 'content-type': 'application/json'\n}\n\nresponse = requests.request(\"POST\", url, headers=headers, data=payload)\n\nprint(response.text)\n" } ], "selectedLanguageId": "HM8g4CUNahctdQf39wbvC" }, "results": { "languages": [ { "id": "response-0-201", "language": "201", "code": "// Created version\n{\n \"version_number\": 2,\n \"asset_id\": \"5d7f910551b00a722e0418830cee6631\",\n \"title\": \"sample_image.png\",\n \"type\": \"image\",\n \"mime_type\": \"image/png\",\n \"created_at\": \"2019-10-06T13:15:30Z\",\n \"content\": {\n \"type\": \"url\",\n \"value\": \"http://images.cmp.optimizely.com/Zz0xODQ3NDU3Y2Y2YmYzOTlmNjkyOTgyZDY3Y2I3YWM2OA==S\"\n },\n \"links\": {\n \"asset\": \"https://api.cmp.optimizely.com/v3/images/5d7f910551b00a722e0418830cee6631\"\n }\n}" }, { "id": "response-1-400", "language": "400", "code": "// Client error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}" }, { "id": "response-2-401", "language": "401", "code": "// Authorization error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}" }, { "id": "response-3-403", "language": "403", "code": "// Permission error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}" }, { "id": "response-4-404", "language": "404", "code": "// Not found error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}" }, { "id": "response-5-422", "language": "422", "code": "// Unprocessable entity error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}" } ], "selectedLanguageId": "response-0-201" } }, "children": [ { "text": "" } ] }