# Attachment > Interface in domain **Assets** - HTML: [Attachment.html](Attachment.html) - Raw SDL: [Attachment.sdl](Attachment.sdl) - Covered by: [llms.txt](../llms.txt) `AttachmentInterface` for `Attachment` returnable types. ## Fields - `id`: `ID!` — `Attachment` Id. - `creator`: `User!` — The `User` who created the `Attachment` on Frontify. - `createdAt`: `DateTime!` — `DateTime` of the `Attachment` creation. - `modifier`: `User` — The `User` who last modified the `Attachment` on Frontify. - `modifiedAt`: `DateTime` — `DateTime` of the `Attachment`'s last modification. - `filename`: `String` — The `Attachment`'s filename. - `name`: `String` — The `Attachment`'s name or title. - `extension`: `String` — The `Attachment`'s original file extension. - `type`: `String` — The `Attachment`'s Media (MIME) type. - `size`: `BigInt` — The `Attachment`'s size in bytes. - `externalId`: `ID` — The `Attachment`'s External Id. ## Related mutations - [`createAttachment`](../mutation/createAttachment.md) - [`deleteAttachment`](../mutation/deleteAttachment.md)