What type of files do I export an assemble from Fusion360?

Hi. I want to export an assemble from fusion360, so I can upload here. Every time I upload the file (.iam .STEP .3mf), the decals don't appear on the model. I want to export the assemble in a way people can openne and see the model as it is in fusion360. What type of file can I export from Fusion360? And what type of files should I upload on GrabCAD? Thank you.