Has anyone found a solution to this?

Use getLocalPath() method to get full path of files.

Just make sure you don't have the same field name in your table with the relationship name.

Config::get('cms.storage.uploads.path')
if the file is uploaded via media manager use
Config::get('cms.storage.media.path')
If u want the url use the url(somePath) helper

when i uploaded the image attachment_id is null but the images are uploaded .