Problem promoting multiple features

Hi all,

I'm trying to bring in data from an AutoCad  file. I set up my project in the GSA and now I've cleaned up some of the linework and created shapes. If I promote a shape, I can post it and all is well.

Since there are a lot of elements to promote, post, and attribute, I'd like to select all of my buildings and promote them at once. When I do this I get a message like Converted 213 element(s) into 1 feature(s) and then when I post I get an error that the geometry is invalid. It appears that all of these elements are really being promoted to a single, multipolygon feature.

About my feature setup: I have a structure_existing_area_collection, and I'm trying to promote the to the structure_existing_area subfeature. I have "Created associative regions" disabled under Symbology -> Fill Type.

Any idea what I might be doing wrong here? I thought I'd tested promoted multiple elements before without issue. FWIW, I just upgraded to the latest Map.

thanks,
-Rob