I use a Samsung android tablet all the time and it's fairly easy on here. If you want the pictures to be bigger when you upload them, you just switch to desktop view and you can choose the size. I have noticed though that sometimes when using Chrome, it wood p won't let me upload pictures BUT I just switch to the Internet browser instead and it works just fine. It may be a chrome issue.
Thanks! Was looking at the Galaxy 10 in particular, so great to know!