unable to meta validate for s3 urls with remote data

[quinnwai]

Describe the bug
When I supply my own metadata, I am unable to prepend my data with s3:/// in the documentreference content.url . It has to be file:///. Why?

To Reproduce
Steps to reproduce the behavior:

1. Clone down any data project / remote add a file to a repo
2. Change the content.url to be prepended with s3:/// instead of file:///
3. meta validate

Expected behavior
Expected meta validate to pass and file to be downloadable after

Environment (please complete the following information):

• Version: 0.0.7rc22 (development at 2877cd5)

Additional context
Add any other context about the problem here.