-Using a NSl-
NSL's are meant to be a faster ,cleaner way to backup, tranfer, upload ,or send sprites and their palettes.
Navigate to the sprite you want to export (ie, Index: 0, Index: 34, Index: 151)
In the file menu (top bar) select "export" and "export sprite library" or just press Crtrl-E
Save it somewhere
Navigate to the sprite you want to overwrite (Same examples as above)
When you want to use the NSL goto file (top bar) select "import" and "import sprite library"
Click load and then select your file,
You can save individual frames, the palette, or all frames and the palette.
If your wondering on the NSL format...
NSL files are currently formatted as such: