Cannot upload files with ACL public-read to Digital Ocean spaces - amazon-s3

Question

I'm trying to upload images to a Digital Ocean space from the browser. These images should be public. I'm able to upload the images successfully.
However, though the ACL is set to public-read, the uploaded files are always private.
I know they're private because a) the dashboard says that the permissions are "private", and b) because the public urls don't work, and c) manually changing the permissions to "public" in the dashboard fixes everything.
Here's the overall process I'm using.
Create a pre-signed URL on the backend
Send that url to the browser
Upload the image to that pre-signed url
Any ideas why the images aren't public?
Code
The following examples are written in TypeScript and use AWS's v3 SDK.
Backend
This generates the pre-signed url to upload a file.
import { S3Client, PutObjectCommand } from '#aws-sdk/client-s3'
import { getSignedUrl } from '#aws-sdk/s3-request-presigner'
const client = new S3Client({
region: 'nyc3',
endpoint: 'https://nyc3.digitaloceanspaces.com',
credentials: {
accessKeyId: process.env.DIGITAL_OCEAN_SPACES_KEY,
secretAccessKey: process.env.DIGITAL_OCEAN_SPACES_SECRET,
},
})
const command = new PutObjectCommand({
ACL: 'public-read',
Bucket: 'bucket-name',
Key: fileName,
ContentType: mime,
})
const url = await getSignedUrl(client, command)
The pre-signed url is then sent to the browser.
Frontend
This is the code on the client to actually upload the file to Digital Ocean. file is a File object.
const uploadResponse = await fetch(url, {
headers: {
'Content-Type': file.type,
'Cache-Control': 'public,max-age=31536000,immutable',
},
body: file,
method: 'PUT',
})
Metadata
AWS SDK: 3.8.0

Answer 1

Turns out that for Digital Ocean, you also need to set the public-read ACL as a header in the put request.
//front-end
const uploadResponse = await fetch(url, {
headers: {
'Content-Type': file.type,
'Cache-Control': 'public,max-age=31536000,immutable',
'x-amz-acl': 'public-read', // add this line
},
body: file,
method: 'PUT',
})

Answer 2

I don't have the reputation to comment, hence adding a response. Thank you #Nick ... this is one of the few working examples of code I have seen for DigitalOcean pre-signed url. While the official DigitalOcean description here mentions Content-Type is needed for uploading with pre-signed urls, there is no example code.
Another mistake that prevented me from uploading a file using pre-signed URLs in DigitalOcean was using 'Content-Type':'multipart/form-data' and FormData().
After seeing this post, I followed #Nick's suggestion of using a File() object and 'Content-Type':'<relevant_mime>'. Then, the file upload worked like a charm. This is also not covered in official docs.

Answer 3

Try this to force ACL to Public in Digital Ocean Spaces:
s3cmd --access_key=YOUR_ACCESS_KEY --secret_key=YOUR_SECRET_KEY --host=YOUR_BUCKET_REGION.digitaloceanspaces.com --host-bucket=YOUR_BUCKET_NAME.YOUR_BUCKET_REGION.digitaloceanspaces.com --region=YOUR_BUCKET_REGION setacl s3://YOUR_BUCKET_NAME --acl-public