The "save as" is different, and MUCH more annoying, for assemblies than for parts. You cannot even see the entire existing name, it is in a tiny "cell", vs the straightforward data entry window used for parts. With the part version, you can see what is already used, you can see the entire name, and no multi-click nonsense trying to get to the right edit status. The assembly version is just inconvenient to an un-necessary extreme in format. (No problem with the "where do I put it?" question, that is OK.