"In macOS Mojave or later, you can change the default location of saved screenshots from the Options menu in the Screenshot app."
Quickly save what's on your screen.
support.apple.com
As mentioned in the original post, Video was already selected, but screenshots aren't saving there or anywhere else I'm seeing for Control+Shift+Command+3.
The actual command to save a full screenshot to your default location is Command+Shift+3. Adding Control while you press and hold the other keys copies a screenshot to the clipboard. You can then paste it where you wish.
See last part on this page:
Quickly save what's on your screen.
support.apple.com
I tried Command+Shift+3, and it made the same camera click sound (as Control+Shift+Command+3), but showed a screenshot thumbnail box at the bottom right. That's nice and all, but the issue mentioned is that I accidentally hit Control+Shift+Command+3, which makes the camera click sound, and which used to save to the Desktop, but now is apparently saving somewhere else... and I'm worried another user of the computer or a manager or whatever may see something they're not supposed to somewhere (especially if I'm sharing my screen), and I'd like to delete these accidental screenshots.
You can disable Control+Shift+Command+3 in System Preferences – Keyboard – Shortcuts – Screenshoots
View attachment 2152268
Ah I see,
I missed that Control+Shift+Command+3 merely saved to the clipboard 😆 OK so it's Shift+Command+3 that saves as a file. So the picture I just did of my screen testing that out did save to my Video folder.
Now that opens up a new issue, because I want screenshots to be saved to my Pictures/Screenshots folder, but Quicktime video recordings to be saved to my Video or Quicktime folder... these features seem to be so integrated that I can't have those separate settings.
Oh well, I disabled "Save picture of screen as a file [Shift+Command+3]" so I won't be accidentally saving screenshots of the full screen at all, which I think I'll never need anyway, as I can already do that with the Control+Shift+Command+4 tool and a Spacebar tap, which is convenient enough for me overall, as I most-often just want to screenshot a window or sub-window.
Adding Control is my favorite feature of screenshots - then I can just paste it into email/chat/Slack/document/whatever, and not have to worry about the file floating around taking up space.
I agree. This is what I use most.