Can clients have full edit access to a shared Dropbox folder without creating an account?

We’re having trouble setting up Dropbox to function as our agency’s main file management system for clients.

Here’s what we need:
We want to share individual folders with each client so they can:Upload any type of fileCreate new foldersMove files aroundDelete files or foldersFully manage their content within their own shared folderHowever, they should only have access within their own assigned folder and any subfolders—not outside of it.

The challenge we’re running into is that we want clients to have this full level of access without having to create a Dropbox account. Many of our clients aren’t tech-savvy, so we want to make this as simple as possible—just open the link, manage files, done.

Is there any way to grant full folder access and editing abilities to external users without requiring them to sign in or create an account? Or would that level of permission always require a Dropbox login?

We’d love to know if there’s a workaround, setting, or third-party integration that might make this possible.