Hey @lostbunny! Thanks for posting here.
Do you mean that when taking screenshots in the past, and hitting on the PrtScn button, they were being saved to your Dropbox account?
If yes, please follow these steps and make sure the “Share screenshots and screen recordings using Dropbox.” option is enabled in your app preferences.
Otherwise, if you were previously using Dropbox Capture to automatically save your screenshots to Dropbox, you can use it again this way.
Let me know if that helps.