Step 1: Tap the '3 dots' on the right of any Area/Item for the more options drawer to appear.

Step 2: Tap either 'Rearrange Photos' or 'Reassign Photos' as required.

Step 3: Drag and drop to Rearrange or select photos to Reassign accordingly.
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​Rearrange: When Rearranging photos, you only need to use your finger to drag them into the order you wish for them to display in and then tap 'Save Order'.
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​Reassign: When Reassigning photos, simply tap the photos you wish to reassign and then tap 'Next' then select the new Area/Item to assign the photos to and tap 'Reassign'.