Instagram widget returns "Instagram has returned invalid data." How can I fix it without update theme?
You can use this plugin to connect to your instagram account:
using shortcode to display images: https://prnt.sc/pso4bu
Can I customize the view with new plugin for responsive usage: different image countfor different device size&
That is using 3rd plugins so there is no option to custom the view. You should contact the plugin author for more details.