i wonder why some of my products don't turn up in google shopping even though i have the correct format of the attributes needed. and i'm sure i've uploaded the txt file correctly. has it something to do with ranking? but i can't even see some in "sort by prices". in some cases, they turn up in "sort by seller rating" but not on the others.i wonder what the problem is.i need some advise so i can see my products.can you help me?