t730 wallpaper question

i have been able to down load gif files to my phone using pst 6.7 and mbe 1.0 . but if i download a jpeg of the net and convert it to a gif file it wont show up in the viewer. but i used sistor gsm and the showed up in the phone. do the short version is if a convert a file form a jpeg to a gif it wont show ip in my media viewer. is the a reason why? and how do i get them to show up?

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I can't seem to get it up aswell