Dear @LevivanGelder
Yes this is a tricky one, knowing which area - Wordpress , Lay Theme or Hosting provider is the issue.
The thing is that you had no problem uploading the first 50 images, which makes me think its database related not 'Theme' Function related - However
As some first steps of debugging to make sure before proceeding:
Wordpress, Lay Theme & Laytheme's Addons are all up to date ?
Any Custom CSS or JS that may interfere is temporarily removed.
Any third-party plugins de-activated to see if this resolves the issue.
If using a WordPress Cache plugin, disable it or clear your cache.
License key not activated - (in website blank situations or button not available)
If your WordPress Dashboard shows a warning "PHP Update required"
please update your PHP version in your webhost control panel.
Additionally please take a look at https://laytheme.com/troubleshooting.html for known problems.
Also just to make sure go to - Admin bar > settings > Media nothing odd is going on in there?
If possible could you post a link to your website - maybe something in the front-end console shows some obvious red flags! :)
Talk soon & best wishes
Richard