Seasonal ItemsWith Seasonal Items you have two options when uploading your skins / or edits.
You can choose to upload one single image under the "All season" option.
This means that during all in game season the items will remain the same.
OR you can choose to upload the seasonal images under "Winter, Spring, Summer & Fall".
All 4 must have an image for the skin to change from season to season,
this happens automatically as the seasons change in game.
You can only submit one or the other not both at the same time.
When you are happy with the item and would like to submit it give it a Name.
Once named Hit submit and note that it will cost you between 25 to 100 Luna to be approved.
Once you hit submit a small pop up with appear and your item will now be waiting approval.
You will receive a notification when it has been approved.
All season Entry example -> Season Entry Example

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Non Seasonal ItemsPets can not be seasonal and will only show with the one option to upload into.
To Upload hit the upload button under the save button.
Once uploaded a small preview of the item and how it will look in world will show up.
If you notice anything that is off or that doesn't line up stop here and go back to editing it.
When you are happy with the item and would like to submit it give it a Name.
Once named Hit submit and note that it will cost you 25 Luna to be approved.
Other items can cost More so be sure to check what item costs what.
Once you hit submit a small pop up with appear and your item will now be waiting approval.
You will receive a notification when it have been approved.