Prepare a compound or a graph for bifcmd

Your graph needs to be self-contained.

For example, you cannot include a Maya mesh by dragging it into the graph from the Outliner. Instead, you need to read it in via an alembic or bob file.

It is preferable to publish a graph than to publish a compound.

bifcmd does not support input or output ports of auto type, and publishing a graph avoids this issue. Alternatively, you can also set your port type so that it is no longer an auto.