Many people document their trips on cell phones these days. And I still carry 2 DSLR's with me. If weight is that important I would recommend a small high quality camera like the Sony Rx100. The newer models are expensive though, but you could find a cheaper older model. The next step would be to decide if you want to be able to edit your photos and video, that would probably require a small laptop computer. If you don't edit I would still recommend some kind of back-up device.
Wishing you tailwinds! Patrick

Written in a friendly, helpful spirit. You are actually trying to ride to Ushuaia, not Ushaia. The u is missing in your title. Sounds like a really ambitious journey, but should be doable and interesting. Wishing you all the best of luck.

Nice bike! It'll do whatever you need it to do.
I'm riding my 2009 LHT down the GDMBr this summer.

Don't believe everything you hear about Mexico. The naysayers have probably never been there.

Spanish is one of the easier languages for English
speakers to pick up.

By the time you have passed the the USA you will have sorted out your gear. However much you are left with it will still be too much.

And yes, your body will hold out.

When you are typing your journal page, right above the area for text is a bunch of blue/gray symbols. One of them is a camera. Click on that.

I find it easiest to load the photos direct from my camera. Some people transfer them to their computers for editing, then load them to the journal.

How do I add photos to each page?

Do you have a photo of the bike you plan to ride? You are allowed to be in the photo, as long as you don't block the view!