Attach Files to Requirements
Provide the ability to ATTACH a file to a requirement. When using References to point to a file, that requires everyone reviewing the requirement to have access to the directory where the file is located. And if the directory changes, then that reference is broken.
Instead, providing the ability to attach/upload a file to a requirement (similar to how it is done in SILK Central) would ensure that whoever has access to the requirement would be able to view attachments.