This is a very serious and critical issue. In Revit projects, it’s often necessary to split into multiple linked files, and light fixtures are frequently created in different files. However, D5 is unable to read the light sources from linked files. For large projects, it is impossible to merge all models together, and doing this extra high-load work just for rendering is not feasible. Please kindly include this issue in your update plans. We greatly appreciate the efforts of the D5 team.