How To Add Shimmer Effect to Your App (And Why You Should) 

You do not need shimmer on 200 items. Shimmer is representative UI so you only shimmer the visible part of your listview which won't be more than 10 items. If you apply animations for 200 items, you don't like your and your users' phone batteries ;)

But I was able to add an image to the column and then drag it (in the preview screen) into the transform component

I am getting a drag effect using container. Somehow second run and following seems to leave lines on my thumbnails.

bro i also have same requirement really frustrating only way i found is through setting up webhook which will push the data to firebase and monitoring firebase for data change