Build tagged as modded even though it contains no cc?

"heymaesims;c-17512258" wrote:
When I had this issue I saved the lot to the library, created a totally new save after disabling cc, place the lot and then overwrite the previous save.

Hey thanks for answering! I actually solved this.

My sim had painted two paintings from reference and apparently that registers as modded too. Once I put both in the inventory I could finally upload the build. :)