When creating attachments, setting theform,gem, ornotebookfield is not supported.
JSON representation
{// Union fieldmaterialcan be only one of the following:"driveFile":{object (SharedDriveFile)},"youtubeVideo":{object (YouTubeVideo)},"link":{object (Link)},"form":{object (Form)},"gem":{object (GeminiGem)},"notebook":{object (NotebookLmNotebook)}// End of list of possible types for union fieldmaterial.}
Fields
Union fieldmaterial. Material content.materialcan be only one of the following:
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[],[],null,["# Material\n\n- [JSON representation](#SCHEMA_REPRESENTATION)\n- [SharedDriveFile](#SharedDriveFile)\n - [JSON representation](#SharedDriveFile.SCHEMA_REPRESENTATION)\n- [ShareMode](#ShareMode)\n- [GeminiGem](#GeminiGem)\n - [JSON representation](#GeminiGem.SCHEMA_REPRESENTATION)\n- [NotebookLmNotebook](#NotebookLmNotebook)\n - [JSON representation](#NotebookLmNotebook.SCHEMA_REPRESENTATION)\n\nMaterial attached to course work.\n\nWhen creating attachments, setting the `form`, `gem`, or `notebook` field is not supported.\n\n| JSON representation |\n|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| ``` { // Union field `material` can be only one of the following: \"driveFile\": { object (/workspace/classroom/reference/rest/v1/Material#SharedDriveFile) }, \"youtubeVideo\": { object (/workspace/classroom/reference/rest/v1/YouTubeVideo) }, \"link\": { object (/workspace/classroom/reference/rest/v1/Link) }, \"form\": { object (/workspace/classroom/reference/rest/v1/Form) }, \"gem\": { object (/workspace/classroom/reference/rest/v1/Material#GeminiGem) }, \"notebook\": { object (/workspace/classroom/reference/rest/v1/Material#NotebookLmNotebook) } // End of list of possible types for union field `material`. } ``` |\n\n| Fields ||\n|----------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| Union field `material`. Material content. `material` can be only one of the following: ||\n| `driveFile` | `object (`[SharedDriveFile](/workspace/classroom/reference/rest/v1/Material#SharedDriveFile)`)` Google Drive file material. |\n| `youtubeVideo` | `object (`[YouTubeVideo](/workspace/classroom/reference/rest/v1/YouTubeVideo)`)` YouTube video material. |\n| `link` | `object (`[Link](/workspace/classroom/reference/rest/v1/Link)`)` Link material. On creation, this is upgraded to a more appropriate type if possible, and this is reflected in the response. |\n| `form` | `object (`[Form](/workspace/classroom/reference/rest/v1/Form)`)` Google Forms material. Read-only. |\n| `gem` | `object (`[GeminiGem](/workspace/classroom/reference/rest/v1/Material#GeminiGem)`)` Gemini Gem material. Read-only. |\n| `notebook` | `object (`[NotebookLmNotebook](/workspace/classroom/reference/rest/v1/Material#NotebookLmNotebook)`)` NotebookLM Notebook material. Read-only. |\n\nSharedDriveFile\n---------------\n\nDrive file that is used as material for course work.\n\n| JSON representation |\n|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| ``` { \"driveFile\": { object (/workspace/classroom/reference/rest/v1/DriveFile) }, \"shareMode\": enum (/workspace/classroom/reference/rest/v1/Material#ShareMode) } ``` |\n\n| Fields ||\n|-------------|--------------------------------------------------------------------------------------------------------------------------------------|\n| `driveFile` | `object (`[DriveFile](/workspace/classroom/reference/rest/v1/DriveFile)`)` Drive file details. |\n| `shareMode` | `enum (`[ShareMode](/workspace/classroom/reference/rest/v1/Material#ShareMode)`)` Mechanism by which students access the Drive item. |\n\nShareMode\n---------\n\nPossible sharing options. Defaults to VIEW if left unspecified, and other values may only be specified within a course work object of type ASSIGNMENT.\n\n| Enums ||\n|----------------------|-----------------------------------------------------------|\n| `UNKNOWN_SHARE_MODE` | No sharing mode specified. This should never be returned. |\n| `VIEW` | Students can view the shared file. |\n| `EDIT` | Students can edit the shared file. |\n| `STUDENT_COPY` | Students have a personal copy of the shared file. |\n\nGeminiGem\n---------\n\nGemini Gem link.\n\n| JSON representation |\n|----------------------------------------------------------|\n| ``` { \"id\": string, \"title\": string, \"url\": string } ``` |\n\n| Fields ||\n|---------|-------------------------------------------------------------|\n| `id` | `string` Gems resource id. |\n| `title` | `string` Title of the Gem. Read-only. |\n| `url` | `string` URL that can be used to access the Gem. Read-only. |\n\nNotebookLmNotebook\n------------------\n\nNotebookLM Notebook link.\n\n| JSON representation |\n|----------------------------------------------------------|\n| ``` { \"id\": string, \"title\": string, \"url\": string } ``` |\n\n| Fields ||\n|---------|------------------------------------------------------------------|\n| `id` | `string` Notebook resource id. |\n| `title` | `string` Title of the Notebook. Read-only. |\n| `url` | `string` URL that can be used to access the Notebook. Read-only. |"]]
