---
title: "Upload Entity File"
method: POST
path: "/api/v1/apps/{app_id}/entity-files/upload"
tags: ["apps"]
---

# Upload Entity File

`POST /api/v1/apps/{app_id}/entity-files/upload`

Store a blob for a File cell. Omit `row_key` to attach to a row that does
not exist yet (an app's create form) — see the module docstring.

## Path parameters

- `app_id` string, uuid, required

## Response `201`

Successful Response

- EntityFileUploadResponse
  - `id` string, uuid, required
  - `name` string, required
  - `file_type` string, required
  - `size_bytes` integer, required
  - `created_at` string, date-time, required

## Other responses

- `422` — Validation Error

## Changes

- **2026-08-21** `8de9cb14f744` — 1 info
  - added the new optional request property `embed_host_app_id`
- **2026-08-19** `f2927c00c4d9` — 2 info
  - the request property `row_key` became optional
  - request property `row_key` list-of-types was widened by adding types `null` to media type `multipart/form-data`

[Change history](https://skmtc.dev/netter/apis/dmi-backend/changes/api/v1/apps/:app_id/entity-files/upload/post.md)

---

[API](https://skmtc.dev/netter/apis/dmi-backend.md) · [All operations](https://skmtc.dev/netter/apis/dmi-backend/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/netter/dmi-backend/revisions/eed6fb164abd/schema)