"invite" link in a pretty straightforward way.
familysearch.org/photos
is what I'm talking about here and after signing in you can upload any photo you have on your computer if they are in JPG or PNG format. If they aren't in that format it's fairly easy to change them.
The first thing I did was upload a photo of me and my siblings and you can tag the photo very easily. It keeps track of everyone you have tagged and saves the photo there. However you can not attach the photo to the family tree side of things unless those in the photo are not living. I am excited to begin scanning and uploading significant photos from my family history. I suggest you all do the same that way your co-conspirators meaning your distant cousins or latter descendants can see these photos of these wonderful people.
Sadly I'll not get to the photos I want to right away but as soon as I can I'll do so
The above pictures show the beginning welcoming images inviting the users to
1. Upload your photos
2. Identify people in photos
3. Link people to Tree
Pretty to the point
I had a moment of confusion as to how to upload the photos. Here it is:
Click "All Photos"
Click the + sign
Click where that dotted circle is
The rest is pretty straight forward
Peace!
