Hi,
I use ZENphoto 1.5 and already increased the upload values in PHP INI to be 20MB and ZENphoto GUI confirms this. On my hoster, PHP is allowed to take up to 100MB of RAM. But if I try to upload some images (eg 9MB), it somehow fails. The thumbnail is not generated and the image is not available for view but can get edited in picture management. No error message somewhere. But if I click zoom later, the image shows up. So upload was somehow successful but thumbnail and preview generation fails. Some other images, even bigger than 10MB, are working. But some images not. This is an example image that fails:
https://nofile.io/f/kF3Y23DSff1/DSC_0055_2.JPG

Any idea what I'm doing wrong? Tried both HTTP and jQuery upload. Same result...

Thanks!

The file size is not what really matters. Please review:
https://www.zenphoto.org/news/problems-with-albums-and-images/

Also corrupt meta data can cause trouble. Also review your server error log.

Thanks! The memory size limit of PHP was the problem. I increased it to 256M and the issues are gone.