Adobe lists my D5300 Nikon as compatible, and others I know can upload .nef from different Nikons. (Don't know another with D5300 to ask)
Don't know what I am doing wrong.
I am using Windows 8.1, and no updates are listed for Windows or for my version of Lightroom 4.
Any help on how to get Lightroom 4 to view and upload .nef files?
I did have to install a codex in windows to view .nef. But that didn't help my LR4.
The above list shows that support for the Nikon D5300 was introduced in Lightroom version 5.3.
You have two options a. Upgrade to LR version 5 (latest version is 5.5) or b. Download and utilize the Adobe DNG Converter version 8.3 or later, to convert the .nef files from the D5300 to dng format. Lightroom version 4 will be able to read and process the dng files.
If you choose the b. option its best you use the option to retain your original raw files. For one your Nikon software will not read the dng files.