My brother put a mod in my game after I asked him to. It was last week, and now I have made a few new Sims, but I try to put them in the Gallery. It says that my Sims are modded. I don't have CC hair ...
I can't tell you what that specific mod does or how/why it would affect your sims that way. But, if you select the option to disable mods before you load your game, you should be able to upload your sims to the gallery. After you're done, you can turn them right back on when you're through.
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