update routes

app/javascript/draw.js

@@ -126,11 +126,10 @@ window.customElements.define('draw-signature', class extends HTMLElement {
       const formData = new FormData()
 
       formData.append('file', file)
-      formData.append('submitter_slug', this.dataset.slug)
       formData.append('name', 'attachments')
       formData.append('remember_signature', 'true')
 
-      return fetch('/api/attachments', {
+      return fetch(`/s/${this.dataset.slug}/upload`, {
         method: 'POST',
         body: formData
       }).then(resp => resp.json())