trying to create a suitelet that will allow us to upload an image to the file cabinent - then upon successful upload automatically display a button that will process a function to insert a watermark. I have the js code to insert the watermark, I have the code to upload the image - i need to know how to auto show the buttton upon complete upload and go from there.. Thanks in advance.

Dominic, can you do something like var fileId = nlapiSubmitFile(file) and then just verify you have a good fileId before adding the button and/or refreshing the page?