EmoteUpload UI changes

[WaterBoiledPizza]

• Moved the image upload box closer to the center

• Added file requirements

• Changed object-fit for file preview to contain

• Moved parent emote version position

• Adjusted format viewer layout

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}