When you post image on Activity Page but you get empty or blank, please check on that post if Privacy function (Accoutn before Time Stamp) is appear or not
If not, it happen because there's few conflict between your Hosting Server and Youzer Privacy table System. Please do these steps to fix it
1. Go to FTP/Cpanel, and go to folder "wp-content/plugins"
2. Create a file and name it with "bp-custom.php" file (if you already have it, please just open it. No need to create a new file one)
3. Put this snippet on the file and save
https://gist.github.com/KaineLabs/d67617af82ef76c67ce75babde6a95c0#file-yzc_reinstall_privacy_table-php
4. Clear your browser cache and test again. The error will be solved then.
5. Please remove the snippet from the bp-custom.php after the problem solved.