https://helpx.adobe.com/photoshop/camera-raw.html

Camera model too new, LR not yet support it

From the link, the ACR does not show it support NX3300 at the moment, that is what I wanna tell
LR using ACR engine (https://helpx.adobe.com/lightroom/help/supported-file-formats.html), as u can see, it referring to the same page when u check the camera raw format
If you want to use LR to import NX3300 raw directly, you may need to wait for the update of LR
It should be coming out very soon

This is exactly same as my case last year when I got my Nikon D750
Workaround always will be using the home brand software to read the raw file, in my case Nikon viewernx

Yes, I do agree you that software that come with the camera should be able to read the raw file.

But at the moment, LR still not yet support the NX3300 camera raw file, if they support, they will show the camera model at the link

Actually not only LR, but if you using Aperture or Capture one, you still need to wait they release the update of their software of support the new camera raw file

My experience of my nikon D750 last year, although I got this camera already, but I dare not to use it to shoot wedding assignment (I am wedding photographer), this is because I shoot raw and each assignment will have few thousand photos
That time LR, Aperture and Capture one all also not yet support the raw file
If I use Nikon software to edit the raw file, I will die
If I convert the photo to jpg, then import to these software, then edit, I loss the flexibility of editing the photo
There is some workaround at that time as using a tools to convert it to dng file, then import to LR, but, too time consuming
I rather keep the camera for leisure purpose until those software support the raw file

After one or two months, yes, all these software start to support it, I just need to go to their website download the update, then install to my computer, and I am able to import the raw directly already.