How to upload rendering file?

to upload a rendering file you should save as the cad model in a picture format (such as *.jpg *...) then upload the photo from Renderings section

One good procedure for uploading rendered files

-Upload the regular files
-Click "renderings" ( Its just the Model feed & Revision buttons)
-Go to the "select file" box (on the bottom) and click the "Browse" button
-Pick the file that you want to place and click the "Open" button
-Then click the "Upload" button
After that you should be done.

I would agree with Ali. I usually use Inventor software and in Inventor there is an "Enviorment" part, in which you would use the Rendering. When you use this Enviorment section there is a part where you can automatically save the files. Most of the files are saved as JPEG or Bitmap format.

in some case if your cad software dose not support or allow to save the model in picture format. there is another way and that is to use a print screen...