I managed to add subfolder to ,,http://localhost/pagebuilderuploader,, , but images are not saved in storage or in DB. Images are stored as base64 data string. Looking to ,,default.htm,, or ,,_builder.htm,, . Storage manager is set to type: 'local' and asset manager is set to ''.
Is saving images in files implemented in your plugin ? If so, how to make it work, because it looks like you have controller ,,uploadFiles,, ?