SubmitForm.app makes sending form submissions and file uploads to Slack easy! Getting Started
Add SubmitForm.app to your Slack and create an endpoint for your form submissions. Add that endpoint to the form action handler to start receiving form submission data in Slack.File Uploads
Enable file uploads by inviting submitform bot (/invite @submitform) to the channel receiving form submissions. Set the form enctype attribute in the form declaration and add the form endpoint to the action handler.