# Attachment

> A document attached to the well or to one of its records. Since v2.3 it is a common type, allowed at the root (attachments) and on historylogs, permits (and their history and condition fulfillments), pumpinstallations, hydrodynamicevents and aquiferanalysis entries.

> **Attachment** = `object`

A document attached to the well or to one of its records. Since v2.3 it is
a common type, allowed at the root (`attachments`) and on `history_logs`,
`permits` (and their `history` and condition `fulfillments`),
`pump_installations`, `hydrodynamic_events` and `aquifer_analysis` entries.

## Properties

### description?

> `optional` **description?**: `string`

Caption or content description.

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### document\_type?

> `optional` **document\_type?**: [`OpenVocab`](/core/api/type-aliases/OpenVocab)\<[`AttachmentDocumentType`](/core/api/type-aliases/AttachmentDocumentType)\>

What the document is. Since v2.3. Recommended values:
[DOCUMENT\_TYPES](/core/api/variables/DOCUMENT_TYPES). Non-canonical values SHOULD use the `x-` prefix.

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### filename?

> `optional` **filename?**: `string`

Original filename for display.

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### id

> **id**: `string`

Unique within its owning `attachments` array. UUID v4 recommended.

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### media\_type

> **media\_type**: `string`

MIME type (e.g. `application/pdf`, `image/jpeg`).

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### sha256?

> `optional` **sha256?**: `string`

SHA-256 of the file, lowercase hex.

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### uri

> **uri**: `string`

Full HTTPS URL. Relative paths are not permitted.