Hello Laura, and welcome to the forum.
The first step I recommend checking is to confirm that your iPad doesn’t have any pending updates for either Scrivener or Dropbox.
To do this, please open the App Store.app on your iPad. Please tap on your Apple ID, which should open a panel titled “Account.” If you tap and hold on your Apple ID here and then swipe down, your iPad will check to see if any apps need updates. You may need to scroll down on the Account panel to see the “Upcoming Updates” information. Tapping “Update All” should get your iPad to ensure that all your apps have the current versions.
The next step I suggest testing is to confirm that Scrivener for iOS is correctly linked to your Dropbox.app. That process is outlined on this Knowledge Base article.
But, just to hit some of the high points, please open the Scrivener app on your iPad and tap “Edit” on its main project screen. Then, please tap on the gear icon, which should have appeared along the bottom edge of the Scrivener interface.
If you have already established Dropbox syncing within Scrivener, I would like to have you tap on the “Unlink Dropbox” option. This will prompt Scrivener to ask you if you want to store your projects locally or keep them on your iPad. I recommend selecting “Keep Local Copies,” which will give you a second copy of them after we re-establish Dropbox syncing.
Next, please tap “Edit” again and then please tap the gear icon at the bottom of the screen again. Then please tap “Link Dropbox.” This should prompt your iPad to open the Dropbox.app, and you’ll see a panel saying “Scrivener would like to access the files and folders in your Dropbox.” Please tap “Allow.”
Your iPad will switch back to the Scrivener app, which will show a window indicating that Dropbox projects are stored in “Apps/Scrivener.” Please tap “Done” on the top right corner of that panel.
Once you’ve re-established that link, please create a small test project on your iPad in Scrivener and see if it will correctly sync that project to your Dropbox/Apps/Scrivener folder.
You’ll want to open that test project on your Mac/PC using a Finder/File Explorer window and by navigating to Dropbox.
If that test project works correctly, then please make sure that the project you’re trying to access on the iPad is stored in that same folder. I’m suggesting this because sometimes users will find they have two Apps/Scrivener folders, which causes issues.