If you have missing photos from your online gallery it may be caused by the following reasons:
Your gallery upload queue is paused
Open the PicPic Social Device Server
Click Gallery Upload
Click START to make sure gallery uploading is enabled
Your internet speeds are too slow to upload
If you are at the event, you may find your internet speeds are too slow to upload and your queue will be filled. You can verify your internet speeds by going to speedtest.net and checking your upload speeds.
Your upload speeds should be at least 10MBPS.
To fix this you have two options:
Switch to another source of internet and see if the files process in the queue
Tell the guests the files will be available by the end of the night when you get to a better source of internet (your home or office).