I remember way back when, when you were able to hit the download button on a flash and it just did what a picture does and made it bigger so you can see the whole thing. but now it has change to where you actually download the flash itself. Is there a way to change or fix it?

No. This behaviour depended on browsers. Some would download it, some would play it. Since flash is being deprecated by Adobe, most browsers are opting to only show flash as objects rather than if viewed from the file.

I'll see if we can add a full screen button for images/videos/flash though.

In the mean time, I use this for various sites: https://chrome.google.com/webstore/detail/fullscreen-anything/olcfgpmjldkkjdclidhcbonieibfhhdh

PLEASE NOTE that Fullscreen Anything is a third party extension. I cannot, nor can e621 provide support for it.

Alright thank you. I know wedms and gifs still go to the full screen when hitting download just not flashes. And I will try it thanks.