"In macOS Mojave or later, you can change the default location of saved screenshots from the Options menu in the Screenshot app."
You can capture the entire screen, a window, or just a portion of the 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:
You can capture the entire screen, a window, or just a portion of the 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.