Question about FL Photo Uploader

So I have been using FL to upload photos for awhile now without any problem, but I have always been taking photos off instagram so they are already square. Now I have found a lot of pictures from twitter, so of course not all of them are square, My question is: Will FL detect they arent square and use the instagram feature to fit in the whole picture? Or will it just upload as is and possible cut off some of the picture? Thanks

I have no idea, but instagram now support rectangular photos.

Best to try yourself on a spam account/