A user has a file that cannot be attached to a Rally user story due to the file size that exceeds maximum allowed 50 MB limit.
It is not possible to attach files that exceed the max allowed size.
A workaround is to upload the file to a server of your choice and use either a standard rich text field like Description or Notes, or a custom rich text field to link to its location.
Example:
When a file that is above 50MB is being attached to a Rally user story an error is generated:
Upload the file to your server if it is not already there and create a link in a rich text field:
Now this link is clickable and open the file location: