Cybord4life on youtube and few vlogs of patients (on youtube) .
One channel is called ''strydenail'' and he is a patient of dr.Assayag and makes a nice vlog of his procedure .
other then this I don't think there can be much more since its a procedure most hide .
Leg lengthening surgery is a very large and complex field. A few videos or documents cannot possibly cover all the areas of LL. Like everyone else, you'll have to do research to find your answers. It will take a while, often months or more.
Also, the overwhelming majority of LL patients want to keep it private, which is why it makes it harder to do research on LL. So be very grateful for any LL patient who is willing to help you out.
On YouTube, Cyborg4Life has an extensive channel. On the YouTube search, look up: Cyborg4Life
strydenail is a patient of Dr Assayag. He did femur lengthening with the Stryde nails last year (when it was available). He has a YouTube channel for his diary. On the YouTube search, look up: strydenail
As a femur Precice 2 patient in consolidation phase, I also have a fairly new and recent YouTube channel. It includes my diary and information on LL. See my signature for the URL to my YouTube channel.