I am guessing you mean when you open up the file with a certain photo-editor, you just see white?
Some photo editing software don't handle transparencies as well as others. Good ones would set transparency as some grid-patterns where as others just show a white background.
If you are simply showing your customer as a sample, consider putting white font over a black background. Otherwise, the customer needs to adjust their image viewing application to adjust the default transparency color.
Good luck!
[addition]
Wow, people are pretty liberal with the thumbs down...Well, if you haven't solved the problem yet, let's keep digging at the problem.
How exactly does the GIF look appear? All transparent?
What editor are you using?
What do you mean 'upload to customink'?
I'll check back momentarily.