HELP! Portion of graphic appears in corner of Animate output, mp4

Hey Animate community. I have recently completyed a project using a motion tween in Adobe Animate.

I created the animation.

I exported using Export>Export Video/Media... This created a swf file.

I opened the swf file in Media Encoder and converted it to MP4. Looks great!

PROBLEM: I sent the mp4 to my phone for posting.

A portion of the graphic that starts the animation shows in the upper left corner

before pressing the play button. I press play and the graphic jumps into place and

then starts to animate, as planned. Why is the graphic not starting to animate in the

position that was intended? I did use the 3d Rotation Tool in AA to make the animation.

NOTE: When viewing the mp4 on my computer, all looks fine.

Thanks for all help.

Matt