the last picture should be in the left list and appear in the right list.
parent element style of picture list

<view class="video-list">
    <block  wx:for="{{urls}}" wx:key="this">
            <view class="img-wrap"> 
                <image src="{{item}}" mode="widthFix"></image>
            </view> 
    </block>
</view>

.video-list{
    -moz-column-count:2; /* Firefox */
    -webkit-column-count:2; /* Safari and Chrome */
    column-count:2;
    column-gap:15px;
    -moz-column-fill:auto;
    -webkit-column-fill:auto;
    column-fill:auto;
    overflow:hidden;
    margin-bottom:120rpx;
}