I found trying to get products into a new Collection a real headache:
1) The upload for multiple products failed to work. (A window opens in Collections showing products to add.) Only one made it actually into the new Collection. I'd try again and first item that appeared in the Collection was replaced by a different item entirely, so the collection only showed one that one item. The new multiple upload system isn't working very well.
2) I had to go to back end store products and add each item for the new Collection ONE AT A TIME. Only then did they each show as being in that Collection. Only then was there a acknowledgement for each being added.
3) The Collection confused the final product item I wanted to add with the front media image picture (though they aren't the same) and kept showing me the media picture as being already in the Collection vs adding the product I wanted to add. After trying several times, I deleted the front media image, then was able to add the product to the collection, then reloaded the media image. (the image names for each were NOT identical or anything, but clearly different.) What a pain.
