To this day I have to use PC to post pics. It is possible to do from phone. You have to upload pic to a image hosting site like Imgur etc then copy the img share link and paste on CFans post. But personally I can never make that work on my phone. Good luck, if you find a image hosting site that works on your phone let us know.
If you get the supporting membership you can upload through your actual post directly. Just thought I'd mention it since youre a contributing member.
Supporting is something that’s new, it’s a really small amount every month you get some cool perks like changing the thing under your name, uploading directly. I think the thread is stickied at the top of the GARM if you’re interested
I started a thread in the Rockets forum you can watch. I posted 2 pics and will add more when I find great locations to fly our banner.