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Hi! It means that you have to upload several photos in one post like it is in the GIF. This feature now is available on iOS and Android.

but do I have to upload that many again? because I already got a good looking gallery you know what I mean?

Yes, i know. But you still do not understand me :)
I have already look at your profile, you really have got great images, but they are separate.
I mean, that one of your posts should contain more than 1 pic
like here https://alpha.steepshot.io/post/@neopch/steemians-london-picnic-meetup--st-james-2018-05-22-18-26-31

I see perfect ;) I will do that tomorrow then, thanks for your help! Have a great rest of the day