Creates a file resource

curl --request POST \
  --url https://api.fluid.app/api/file_resources \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "file_resource": {
    "filename": "brand.css",
    "content": ":root { --dm-blue: #1f4e79; }\n.btn-primary { background: var(--dm-blue); }",
    "content_type": "text/css",
    "relateable_type": "ApplicationTheme",
    "relateable_id": 7310
  }
}
'

import requests

url = "https://api.fluid.app/api/file_resources"

payload = { "file_resource": {
        "filename": "brand.css",
        "content": ":root { --dm-blue: #1f4e79; }
.btn-primary { background: var(--dm-blue); }",
        "content_type": "text/css",
        "relateable_type": "ApplicationTheme",
        "relateable_id": 7310
    } }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    file_resource: {
      filename: 'brand.css',
      content: ':root { --dm-blue: #1f4e79; }\n.btn-primary { background: var(--dm-blue); }',
      content_type: 'text/css',
      relateable_type: 'ApplicationTheme',
      relateable_id: 7310
    }
  })
};

fetch('https://api.fluid.app/api/file_resources', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.fluid.app/api/file_resources",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'file_resource' => [
        'filename' => 'brand.css',
        'content' => ':root { --dm-blue: #1f4e79; }
.btn-primary { background: var(--dm-blue); }',
        'content_type' => 'text/css',
        'relateable_type' => 'ApplicationTheme',
        'relateable_id' => 7310
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.fluid.app/api/file_resources"

	payload := strings.NewReader("{\n  \"file_resource\": {\n    \"filename\": \"brand.css\",\n    \"content\": \":root { --dm-blue: #1f4e79; }\\n.btn-primary { background: var(--dm-blue); }\",\n    \"content_type\": \"text/css\",\n    \"relateable_type\": \"ApplicationTheme\",\n    \"relateable_id\": 7310\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.fluid.app/api/file_resources")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"file_resource\": {\n    \"filename\": \"brand.css\",\n    \"content\": \":root { --dm-blue: #1f4e79; }\\n.btn-primary { background: var(--dm-blue); }\",\n    \"content_type\": \"text/css\",\n    \"relateable_type\": \"ApplicationTheme\",\n    \"relateable_id\": 7310\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.fluid.app/api/file_resources")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"file_resource\": {\n    \"filename\": \"brand.css\",\n    \"content\": \":root { --dm-blue: #1f4e79; }\\n.btn-primary { background: var(--dm-blue); }\",\n    \"content_type\": \"text/css\",\n    \"relateable_type\": \"ApplicationTheme\",\n    \"relateable_id\": 7310\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "file_resource": {
    "id": 88215,
    "url": "https://dunder-mifflin.fluid.app/assets/public.application_themes.7310/brand.css",
    "preview_image_url": null,
    "alt_text": null,
    "handle": "brand-css",
    "content_type": "text/css",
    "content_size": 214,
    "content": ":root { --dm-blue: #1f4e79; }\n.btn-primary { background: var(--dm-blue); }",
    "relateable_id": 7310,
    "relateable_type": "ApplicationTheme",
    "metadata": {},
    "created_at": "2026-09-21T16:05:47Z",
    "updated_at": "2026-09-21T16:05:47Z",
    "filename": "brand.css",
    "version": "1",
    "non_binary": true,
    "dam_ready": true,
    "dam_processing_status": "ready",
    "dam_tags": [],
    "dam_upload_queued": false
  },
  "meta": {
    "request_id": "4f1c2a9e-7b3d-4e8a-9c61-2d5f8a0b3e17",
    "timestamp": "2026-09-22T15:04:12Z"
  }
}

{
  "message": "<string>",
  "error": "<string>",
  "error_message": "<string>",
  "errors": "<string>",
  "meta": {
    "request_id": "<string>",
    "timestamp": "2023-11-07T05:31:56Z"
  }
}