Q: uploading raw files

how to upload my raw files from SD card and see them in my photos ?

Insert the SD card into a card reader, plug it into a USB port and launch Photos. 

See this Help page:

              From a camera or mobile device      

It will depend on the RAW format of your camera if Photos can read them. The RAW support is camera specific.

See this list of supported cameras: Digital camera RAW formats supported by OS X El Capitan - Apple Support

Is your camera on the list?

After you import the photos, Photos will develop the RAW files in the background and create previews and thumbnails and you can browse and edit  them in Photos like any other photos.

Look at this thread also, if your camera use RAW+JPEG as an File-pair:

https://discussions.apple.com/thread/7701657

Kind regards

Roland