I’m trying to post a piece of dollhouse furniture to the 3d warehouse but many times when I tried to download after, it would automatically change to full size. How do I post the picture so it would download as doll-size?
I’ll guess you modeled the furniture at full size or at least not at doll house size and then scaled it down. Open your original file, right click on the component and choose Scale Definition to correct the definition’s scale to match the doll house size. Then upload it to the 3D Warehouse.
If you have difficulty with that, share your skp file with us so we can see what you’ve got.
FWIW, you aren’t posting a picture of the furniture.