If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
I would like to add in a custom thumbnail for each of my portfolio items vs have them automatically created. Is there a way I can do this?
I am sorry, that not possible :/
Wordpress generates all images by itself automatically and there is no way to replace the thumbnails of a post with something different without very heavy customization work :/
If this is very important for you might want to hire a developer form one fo those sites:
in addition wpcandy also has a job directory with designers and developers that might be helpful:
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