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.
The developers from SquareWebsites created Uploader, a javascript plugin that allows to add file upload fields to Squarespace forms and a small web-service to handle uploads. The plugin is very easy to use and set up and it works just perfectly with Squarespace forms. You can connect your Google Drive and also, you can have one account for multiple sites. Read more about its features in this article.
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.