Thanks for replying.
So I'm using the screenshot app the mac comes with. I've been using it for years without a problem. I've tried a few things and got some info. First I tried saying in different places. All the defaults work (ie desktop, clipboard, etc). But I always had my screenshots saved directly to one of my external drives (I labeled it screenshots). That way I can always just look for my last screenshot on my phone and whatnot. But now it doesn't want to save any screenshot on any of my externals.
So that's the issue I have. I can't save my screenshots anywhere outside the internal hard drive or iCloud. I mean I can make an alias and move the images afterward, but that's an extra step than I previously did not have plus if I screenshot a lot it will take up a lot of space in my iCloud account. I rather they exist in my external in one of my dropbox folders. Nowhere in my external drives do they save. The image is snapped, but no file is saved.
What can I do?