iCloud upload and download not syncing

Hello MatthewVR46,

Thank you for reaching out to Apple Support Communities.

These steps may be able to help with your syncing issue:

"Things to check first

1. Check the system status of iCloud Contacts, Calendars, or Reminders for services outages or connection issues.
2. If a reminder isn't showing up on some of your devices, make sure that your iPhone and iPad have the latest version of iOS or iPadOS, or that your Mac has the latest version of macOS.
3. Make sure that you're signed in to iCloud with the same Apple ID on all of your devices. Then, check that you turned on Contacts, Calendars, and Reminders in your iCloud settings.
4. Check that the date and time settings on your device are correct for your current location."

More details cane found here: If your iCloud Contacts, Calendars, or Reminders won’t sync

If the issue persist, can you provide a few more details? What exactly isn't not syncing? When did you first notice this? Also, are you seeing any errors or alerts?

Cheers!