I have published a new plugin that lets you add a sketchpad to your application. This is great to collect signatures for example. This plugin supports ‘Undo’, ‘Redo’ and ‘Clear’ workflow actions.
Demo page (editor is public!): https://pluginpreview.bubbleapps.io/sketchpad
Plugin page: https://bubble.io/plugin/sketchpad-1597270478874x416512636522332200
You can always reach out to me for questions, bug reports or feature requests!