1:You have uploaded the wrong files: that may mean tray files containing a sim who is wearing your content, or a texture image. You need to upload the .package file which is created by ColorMagic, Sims4Studio or another Sims4 compatible tool.

1:Your upload is a recolour of a mesh you made yourself, but you haven't included the mesh. Make sure to attach the mesh as well, so downloaders can get all the needed files in one place. You may need to tick "new mesh" as the upload type as well, and provide additional pictures and information for your new mesh.

5:You've uploaded working .package files containing your content. Perfect!