Setting the thumbnail option

Hello,

I would like to suggest to add the possibility of setting up the thumbnail while uploading a 3D model. Now we just are informed that the first preview picture will be the thumbnail, but after uploading, it often turns out that the picture is cut off from the bottom and upper edge. I would like to have a possibility to draw on the thumbnail picture an area that will be visible as a thumbnail on the main site. It will save us the time of resizing the picture, saving and then checking how it looks on the main site.

Thank you! :)