Welcome to the forums.
I use quickpic for my photo viewing needs. I will admit that I don't do social media things, so I don't know about uploading photos and such.
For my musical enjoyment, I've used Poweramp for the longest time It is a paid app, but I've never had one moment where I have regretted paying for it. Poweramp has a free 2 week trial.
https://play.google.com/store/apps/details?id=com.alensw.PicFolder&feature=nav_result #?t=W251bGwsMSwxLDMsImNvbS5hbGVuc3cuUGljRm9sZGVyIl 0
https://play.google.com/store/apps/details?id=com.maxmpz.audioplayer&feature=search_r esult#?t=W251bGwsMSwxLDEsImNvbS5tYXhtcHouYXVkaW9wb GF5ZXIiXQ
Here is a link to the Google playstore, you may have a easier time surfing it on your computer vs phone.
Hope this helps.