can't open multiple raw pics in camera raw.

@Alluring_experts6744 curious did it not work before? Or was this just a recent issue and didn't work as well in the past. I would reset Photoshop preferences if it did work, and suddenly, it stopped opening multiple pics in Camera Raw.  

Avoid double-clicking a single file after selecting many, as that might only open the one you double-clicked. 

I normally drag and drop my files directly onto the Photoshop application icon (either on your desktop, taskbar/dock, or in the Applications folder). But, since you are experiencing some issues you can try any of these methods:

Use Adobe Bridge as it works better sometimes with Raw images and get them all into one Camera Raw session with the filmstrip.. Open Adobe Bridge. Navigate to the folder containing your RAW files. Select all the RAW files you want to edit together. (Click the first, then Shift-click the last, or Control-click individual ones). Right-click on any of the selected files and choose "Open in Camera Raw."

Or in Photoshop, use the "Open" menu, File > Open...Navigate to your RAW files. Select multiple RAW files (using Shift-click or Control-click). Click "Open." This should also open them all in a single Camera Raw instance. 

Or from Windows Explorer, Navigate to your RAW files. Select multiple RAW files (using Shift-click or Control-click). Right-click on any of the selected files and choose "Open with > Adobe Photoshop." Photoshop should then launch, and if the files are RAW, it will automatically route them all through a single Camera Raw dialog with the filmstrip.