File Attachment Option for Squarespace Forms
As we know, Squarespace Form Block doesn't currently support attaching files to submissions, but you can accomplish this using a third-party service or one of the free and simple solutions that we feature in this article.
1. Squarespace Websites Uploader by SquareWebsites.
2. Dropbox Integration to Receive Uploaded Files
A nice workaround by AmazingAndrea allows to add a button to Squarespace forms to upload files to a Dropbox folder directly. You will find your uploads in your File Request folder once a user submits the form.