Hello, thank you for reaching out to Microsoft Q&A.
Autosave for screenshots is only available in the Snipping Tool, which is included with Windows 11 (OS version 22000.0 or higher).
On Windows 10 PCs, you have the Snip & Sketch tool instead of the Snipping Tool. Snip & Sketch is an older version and does not include the autosave feature.
Starting with the Snipping Tool app version 11.2209.2.0, the Snipping Tool will now automatically save your screenshots by default to the Screenshots folder in the Pictures folder (ex, "%UserProfile%\Pictures\Screenshots") for your account.
Let me know if you still need more help.