Because "Block Host File" is not standard AutoCAD terminology, I have broken this down into the three most likely scenarios.
In AutoCAD, a refers to the source drawing ( .dwg ) that stores block definitions. This is typically: autocad block host file updated
to synchronize your block references with their new definitions. Xref Updates for Cloud Collaboration : If you are working in cloud environments like BIM 360 or Autodesk Docs Because "Block Host File" is not standard AutoCAD
: If you updated a block in a source library, right-click the block in your Tool Palette and select Redefine to update the host file. autocad block host file updated