S3 has a concept of pre-signed links granting temporary access to a single file.

My S3 client uses this for minimal-infrastructure sharing of files and upload of files where the other part just needs a web browser.

apps.apple.com/app/apple-st...

Try out HyperContext for automating your Mac from Claude in a controlled way. workingcopy.app/test/HyperCo...

There are other similar tools but HyperContext makes it particularly easy to restrict which Mail folders, Contacts groups, Reminders lists, Calendars and Shortcuts are available to Claude.

By using presigned put links from a page hosted via presigned get links you can make secure requests for anybody with a browser to upload to your S3 bucket.

It works with AWS, Backblaze, MinIO instances and I would expect any other S3 service with presigned link support.

Coming soon to s3files.app

You can get some of the way using a share sheet shortcut like
www.icloud.com/shortcuts/45...

I made a small little menu bar thing showing upload progress in the FTP + S3 apps.

Drag files to and from S3 storage on iOS and Mac:
apps.apple.com/app/apple-st...