assistance needed creating gif

[echoMOTN]

Greetings, all. I'm familiarizing myself with this software but experiencing a problem creating a gif, or rather, exporting it. I've captured a part of game and created a gif with another program. I opened the gif with GIMP and I went through each frame to erase the background and leave transparency in its absence. Now, when I export, all the layers are shown when the gif is viewed, one after the next. I want the previous frames to become hidden when the next one is displayed. I've toyed with all the options in the export settings and cant seem to find a solution. any advice? xcf project file is available here:
https://nofile.io/f/wVgVCsOMR2e/Next+Level+HD+Taunt.xcf
thanks in advance!