Replace Asset File - Filemonk API

curl -X POST 'https://app.filemonk.io/api/v1/external/assets/a1b2c3d4-e5f6-7890-abcd-ef1234567890/replace' \
  -H 'X-Auth-Token: fm_api_key_your_key_here' \
  -H 'Content-Type: application/json' \
  -d '{
    "asset": {
      "filename": "brushes-pack-v3.zip",
      "byte_size": 2097152,
      "content_type": "application/zip"
    }
  }'

import { readFile, stat } from 'node:fs/promises';

const ASSET_ID = 'a1b2c3d4-e5f6-7890-abcd-ef1234567890';
const path = './brushes-pack-v3.zip';
const { size } = await stat(path);

const replace = await fetch(
  `https://app.filemonk.io/api/v1/external/assets/${ASSET_ID}/replace`,
  {
    method: 'POST',
    headers: {
      'X-Auth-Token': 'fm_api_key_your_key_here',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      asset: {
        filename: 'brushes-pack-v3.zip',
        byte_size: size,
        content_type: 'application/zip'
      }
    })
  }
).then(r => r.json());

// Upload the new body to the presigned URL.
await fetch(replace.upload.url, {
  method: 'PUT',
  headers: replace.upload.headers,
  body: await readFile(path)
});

import os
import requests

ASSET_ID = 'a1b2c3d4-e5f6-7890-abcd-ef1234567890'
path = './brushes-pack-v3.zip'

replace = requests.post(
    f'https://app.filemonk.io/api/v1/external/assets/{ASSET_ID}/replace',
    headers={'X-Auth-Token': 'fm_api_key_your_key_here'},
    json={
        'asset': {
            'filename': 'brushes-pack-v3.zip',
            'byte_size': os.path.getsize(path),
            'content_type': 'application/zip'
        }
    }
).json()

with open(path, 'rb') as f:
    requests.put(
        replace['upload']['url'],
        headers=replace['upload']['headers'],
        data=f
    )

{
  "asset": {
    "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "type": "internal",
    "name": "Photoshop Brushes Pack",
    "filename": "brushes-pack-v3.zip",
    "content_type": "application/zip",
    "byte_size": 2097152,
    "watermark_asset": false,
    "autogenerate_licence_key": false,
    "created_at": "2026-04-08T10:00:00Z",
    "updated_at": "2026-04-09T12:30:00Z"
  },
  "upload": {
    "method": "PUT",
    "url": "https://<bucket>.r2.cloudflarestorage.com/external_api/<shop_id>/9c4b.zip?X-Amz-Signature=...",
    "headers": {
      "Content-Type": "application/zip",
      "Content-Disposition": "inline; filename=\"brushes-pack-v3.zip\""
    },
    "expires_at": "2026-04-09T13:30:00Z"
  }
}

{
  "error": "Only internal assets can have their file replaced"
}

{
  "error": "Asset not found"
}

POST

assets

{id}

replace

curl -X POST 'https://app.filemonk.io/api/v1/external/assets/a1b2c3d4-e5f6-7890-abcd-ef1234567890/replace' \
  -H 'X-Auth-Token: fm_api_key_your_key_here' \
  -H 'Content-Type: application/json' \
  -d '{
    "asset": {
      "filename": "brushes-pack-v3.zip",
      "byte_size": 2097152,
      "content_type": "application/zip"
    }
  }'

import { readFile, stat } from 'node:fs/promises';

const ASSET_ID = 'a1b2c3d4-e5f6-7890-abcd-ef1234567890';
const path = './brushes-pack-v3.zip';
const { size } = await stat(path);

const replace = await fetch(
  `https://app.filemonk.io/api/v1/external/assets/${ASSET_ID}/replace`,
  {
    method: 'POST',
    headers: {
      'X-Auth-Token': 'fm_api_key_your_key_here',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      asset: {
        filename: 'brushes-pack-v3.zip',
        byte_size: size,
        content_type: 'application/zip'
      }
    })
  }
).then(r => r.json());

// Upload the new body to the presigned URL.
await fetch(replace.upload.url, {
  method: 'PUT',
  headers: replace.upload.headers,
  body: await readFile(path)
});

import os
import requests

ASSET_ID = 'a1b2c3d4-e5f6-7890-abcd-ef1234567890'
path = './brushes-pack-v3.zip'

replace = requests.post(
    f'https://app.filemonk.io/api/v1/external/assets/{ASSET_ID}/replace',
    headers={'X-Auth-Token': 'fm_api_key_your_key_here'},
    json={
        'asset': {
            'filename': 'brushes-pack-v3.zip',
            'byte_size': os.path.getsize(path),
            'content_type': 'application/zip'
        }
    }
).json()

with open(path, 'rb') as f:
    requests.put(
        replace['upload']['url'],
        headers=replace['upload']['headers'],
        data=f
    )

{
  "asset": {
    "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "type": "internal",
    "name": "Photoshop Brushes Pack",
    "filename": "brushes-pack-v3.zip",
    "content_type": "application/zip",
    "byte_size": 2097152,
    "watermark_asset": false,
    "autogenerate_licence_key": false,
    "created_at": "2026-04-08T10:00:00Z",
    "updated_at": "2026-04-09T12:30:00Z"
  },
  "upload": {
    "method": "PUT",
    "url": "https://<bucket>.r2.cloudflarestorage.com/external_api/<shop_id>/9c4b.zip?X-Amz-Signature=...",
    "headers": {
      "Content-Type": "application/zip",
      "Content-Disposition": "inline; filename=\"brushes-pack-v3.zip\""
    },
    "expires_at": "2026-04-09T13:30:00Z"
  }
}

{
  "error": "Only internal assets can have their file replaced"
}

{
  "error": "Asset not found"
}

Beta. The direct upload flow is in active development. The request and response shapes shown here are stable for production use, but we may add new fields or capabilities without notice.

Use this to ship a new version of a file without re-wiring anything. The asset keeps its ID and stays attached to every digital product and order it was already linked to, so buyers downloading it receive the new file automatically — there is no need to create a fresh asset and re-attach it. Only internal assets can be replaced. The flow mirrors creating an internal asset: the response includes a single presigned PUT URL — upload the new file body to that URL to finish. Once the replacement is committed, the previous file is removed and any watermarking is re-applied to the new body. Plan storage quota is enforced on the growth in size (new byte_size minus the current size); the per-file ceiling is 2 GB.

Path parameters

string

required

The ID (UUID) of the internal asset to replace.

Request body

asset

object

required

Show Asset fields

filename

string

required

Suggested attachment name on download for the new file.

byte_size

integer

required

Size of the new file in bytes. Must be positive and at most 2 GB.

content_type

string

Optional MIME type for the new file. Defaults to the asset’s current content type, or application/octet-stream.

Response

asset

object

required

The asset, with its ID unchanged.

upload

object

required

A single-PUT handle (method: "PUT") with the presigned URL and headers required to upload the new file body. See Upload Asset for the field-by-field breakdown.

curl -X POST 'https://app.filemonk.io/api/v1/external/assets/a1b2c3d4-e5f6-7890-abcd-ef1234567890/replace' \
  -H 'X-Auth-Token: fm_api_key_your_key_here' \
  -H 'Content-Type: application/json' \
  -d '{
    "asset": {
      "filename": "brushes-pack-v3.zip",
      "byte_size": 2097152,
      "content_type": "application/zip"
    }
  }'

import { readFile, stat } from 'node:fs/promises';

const ASSET_ID = 'a1b2c3d4-e5f6-7890-abcd-ef1234567890';
const path = './brushes-pack-v3.zip';
const { size } = await stat(path);

const replace = await fetch(
  `https://app.filemonk.io/api/v1/external/assets/${ASSET_ID}/replace`,
  {
    method: 'POST',
    headers: {
      'X-Auth-Token': 'fm_api_key_your_key_here',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      asset: {
        filename: 'brushes-pack-v3.zip',
        byte_size: size,
        content_type: 'application/zip'
      }
    })
  }
).then(r => r.json());

// Upload the new body to the presigned URL.
await fetch(replace.upload.url, {
  method: 'PUT',
  headers: replace.upload.headers,
  body: await readFile(path)
});

import os
import requests

ASSET_ID = 'a1b2c3d4-e5f6-7890-abcd-ef1234567890'
path = './brushes-pack-v3.zip'

replace = requests.post(
    f'https://app.filemonk.io/api/v1/external/assets/{ASSET_ID}/replace',
    headers={'X-Auth-Token': 'fm_api_key_your_key_here'},
    json={
        'asset': {
            'filename': 'brushes-pack-v3.zip',
            'byte_size': os.path.getsize(path),
            'content_type': 'application/zip'
        }
    }
).json()

with open(path, 'rb') as f:
    requests.put(
        replace['upload']['url'],
        headers=replace['upload']['headers'],
        data=f
    )

{
  "asset": {
    "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "type": "internal",
    "name": "Photoshop Brushes Pack",
    "filename": "brushes-pack-v3.zip",
    "content_type": "application/zip",
    "byte_size": 2097152,
    "watermark_asset": false,
    "autogenerate_licence_key": false,
    "created_at": "2026-04-08T10:00:00Z",
    "updated_at": "2026-04-09T12:30:00Z"
  },
  "upload": {
    "method": "PUT",
    "url": "https://<bucket>.r2.cloudflarestorage.com/external_api/<shop_id>/9c4b.zip?X-Amz-Signature=...",
    "headers": {
      "Content-Type": "application/zip",
      "Content-Disposition": "inline; filename=\"brushes-pack-v3.zip\""
    },
    "expires_at": "2026-04-09T13:30:00Z"
  }
}

{
  "error": "Only internal assets can have their file replaced"
}

{
  "error": "Asset not found"
}

Upload Asset Update Asset

​Path parameters

​Request body

​Response

Path parameters

Request body

Response