> ## Documentation Index > Fetch the complete documentation index at: https://apidocs.sessionboard.com/llms.txt > Use this file to discover all available pages before exploring further. # List upload slots > The files an event asks its speakers for — one slot per ask (Poster, Presentation, Handout, …), each with its own deadline, accepted file types and file count, in the order speakers see them. Configured by organizers under **Program → Settings → Files → Use upload slots**. `content_slot_id` on a [session file](/api-reference/session-files/list-files-attached-to-a-session) points at one of these slots, so you can tell a poster from a deck without parsing filenames. Read-only. Active slots only unless `include_archived=true`. An event that still uses a single file request for every session (the switch is off) returns an empty list. Requires `read:sessions` scope (legacy tokens with empty scopes pass). ## OpenAPI ````yaml /api-reference/openapi.yaml get /v1/event/{eventId}/content-slots openapi: 3.1.0 info: title: Sessionboard Public API version: '1.0' description: >- REST API for managing sessions, speakers, contacts, sponsors, exhibitors, and event data on the Sessionboard platform. contact: name: Sessionboard Support email: support@sessionboard.com termsOfService: https://www.sessionboard.com/legal/terms-of-service servers: - url: https://public-api.sessionboard.com description: US Region - url: https://public-api-eu.sessionboard.com description: EU Region security: - ApiKey: [] - BearerToken: [] tags: - name: Events description: Manage events on the platform. - name: Sessions description: Search and retrieve sessions within an event. - name: Session Writes description: >- Create, update, delete, and restore sessions. Requires the `write:sessions` scope. - name: Contact Writes description: >- Create, update, delete, and restore contacts. Requires the `write:contacts` scope. - name: Exhibitor Writes description: >- Create, update, delete, and restore exhibitors. Requires the `write:exhibitors` scope. - name: Sponsor Writes description: >- Create, update, delete, and restore sponsors. Requires the `write:sponsors` scope. - name: Field Writes description: >- Create, update, and delete custom fields. Requires the `write:fields` scope. - name: Speakers description: Search and retrieve speakers within an event. - name: Participants description: | Search and retrieve every contact holding a session role on an event — speakers, chairpersons, moderators and custom roles — with the roles each one holds, and list the event's participant roles. - name: Contacts description: Search and retrieve contacts at the organization or event level. - name: Sponsors description: Search and retrieve sponsors within an event. - name: Exhibitors description: Search and retrieve exhibitors within an event. - name: Event Settings description: >- Retrieve event configuration such as fields, tags, tracks, rooms, formats, levels, languages, and session statuses. - name: GDPR description: Manage GDPR data access and erasure requests. - name: Insights description: >- Query event data using SbQL, generate queries with AI, and manage dashboards. - name: Metadata Writes description: >- Create, update, and delete session metadata (rooms, tracks, tags, formats, levels, languages, statuses). Requires the `write:metadata` scope. - name: Agenda Planning description: >- Manage agenda drafts, draft sessions, scheduling rules, and evaluation personas. Requires the `write:events` scope. - name: Dashboards & Widgets description: >- Create, read, update, and delete dashboards and widgets at the event or organization level. Requires `write:events` scope for writes. - name: Reports & Queries description: >- Create, read, update, delete, and run saved SbQL queries/reports at the event or organization level. Requires `write:events` scope for writes. - name: Transcriptions description: >- Transcript text on sessions — fragments, summaries, insights, and translations. Requires `read:transcriptions` / `write:transcriptions` scopes. - name: Session Recordings description: >- Session audio files for recording archives (live capture or imported audio). Requires `read:transcriptions` / `write:transcriptions` scopes. - name: Media description: >- Upload video or audio files for automatic transcription. Requires `read:media` / `write:media` scopes. - name: Session Files description: > Documents attached to sessions (PDFs, PowerPoint, Word, images, and similar). Simple upload: `POST .../files/upload` (multipart, max 50 MB). Direct-to-storage: create → PUT → complete (max 500 MB). Requires `read:sessions` / `write:sessions` scopes. See the [Uploading session files](/guides/uploading-session-files) guide. - name: OAuth description: >- OAuth 2.1 endpoints for AI client authorization (Claude, ChatGPT). Mounted at `/oauth/` (not `/v1/`). paths: /v1/event/{eventId}/content-slots: get: tags: - Session Files summary: List upload slots description: > The files an event asks its speakers for — one slot per ask (Poster, Presentation, Handout, …), each with its own deadline, accepted file types and file count, in the order speakers see them. Configured by organizers under **Program → Settings → Files → Use upload slots**. `content_slot_id` on a [session file](/api-reference/session-files/list-files-attached-to-a-session) points at one of these slots, so you can tell a poster from a deck without parsing filenames. Read-only. Active slots only unless `include_archived=true`. An event that still uses a single file request for every session (the switch is off) returns an empty list. Requires `read:sessions` scope (legacy tokens with empty scopes pass). operationId: list-content-slots parameters: - $ref: '#/components/parameters/EventId' - name: include_archived in: query required: false schema: type: boolean default: false description: 'Also return archived slots (`is_active: false`).' responses: '200': description: OK content: application/json: schema: $ref: '#/components/schemas/ContentSlotListResponse' examples: two-slots: summary: A poster and a presentation ask value: data: - id: 2783cb27-958a-4a24-89d9-2d71387f04cc name: Poster content_type: poster description: Upload your poster as a single-page PDF. due_date: null due_date_extended: null allowed_file_types: - pdf required: true min_files: null max_files: 1 allow_after_deadline: false order: 0 is_active: true created_at: '2026-10-02T12:04:11.000Z' updated_at: '2026-10-02T19:48:30.000Z' - id: 9a1c6f0e-4a0b-4a4e-8e3f-0c2b1d5e7f90 name: Presentation content_type: presentation description: null due_date: '2026-08-30T21:15:00.000Z' due_date_extended: null allowed_file_types: - word - pdf required: false min_files: null max_files: 1 allow_after_deadline: false order: 1 is_active: true created_at: '2026-10-02T12:04:11.000Z' updated_at: '2026-10-02T12:04:11.000Z' single-request: summary: Event still on a single file request value: data: [] '403': description: Missing read:sessions scope '404': description: Event not found components: parameters: EventId: name: eventId in: path required: true schema: type: integer description: Event ID schemas: ContentSlotListResponse: type: object properties: data: type: array items: $ref: '#/components/schemas/ContentSlot' ContentSlot: type: object description: | One file an event asks its speakers for (SB "upload slot"). Slots are configured under Program → Settings → Files; `session_filters` and role restrictions are internal and not exposed. properties: id: type: string format: uuid name: type: string description: The name speakers see, e.g. "Poster". content_type: type: string enum: - poster - presentation - handout - abstract - custom description: >- What kind of file the slot collects. Poster galleries read `poster` slots. description: type: - string - 'null' description: Instructions shown to speakers above the drop zone. due_date: type: - string - 'null' format: date-time description: Deadline shown to speakers. `null` means no deadline. due_date_extended: type: - string - 'null' format: date-time description: Later date the drop zone stays open until, if the organizer set one. allowed_file_types: type: array items: type: string description: | Accepted type keys (`pdf`, `ppt`, `word`, `excel`, `image`, `png`, `jpeg`, `gif`, `svg`, `video`, `mp4`, `audio`, `zip`, `csv`, `text`). An empty array accepts any type. required: type: boolean description: Whether the slot counts as missing until a file is uploaded. min_files: type: - integer - 'null' max_files: type: - integer - 'null' description: Maximum files per session; `null` means unlimited. allow_after_deadline: type: boolean description: Whether uploads are still accepted after the deadline. order: type: integer description: Position in the list speakers see (0-based). is_active: type: boolean description: >- `false` for archived slots (only returned with `include_archived=true`). created_at: type: string format: date-time updated_at: type: string format: date-time securitySchemes: ApiKey: type: apiKey in: header name: x-access-token description: >- Organization API token. Generate from Organization Settings → API Tokens. BearerToken: type: http scheme: bearer description: >- OAuth 2.1 access token. Obtained via the OAuth PKCE flow at `/oauth/token`. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.