PowerApps: Sharepoint online list attachment preview gallery

Update 6/5/2019: here is another good article: POWERAPPS GALLERY OF ATTACHMENTS

I am learning the new Sharepoint online and PowerApps.  I create a form to edit Sharepoint list with the Attachments field. I would like to show the attachment photos in an preview Image gallery, as this:

PowerApps0001

I find a good link here, and revise it a little bit:

  1. You need to understand DataCard component structure:
    StarVisible, Error Message, DataCardValue, DataCardKey
  2. You need to set the preview Image Gallery Items property to the Attachment DataCard’s DataCardValue component: DataCardValue.Attachments
  3. Under the Image control of the Image Gallery, specify the Image property as: ThisItem.Value
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