if I update my phone will my photos and videos that weren't backed up from iCloud get deleted

Hi cristinaK208,

Thanks for reaching out to the community. Updating your iPhone does not cause data loss. It is recommended that you update for security and to have your apps work at optimum performance. Take a look at the steps and article below for backing up your device and updating.

Backing up your iPhone:

1. "Connect your device to a Wi-Fi network.
2. Go to Settings > [your name], and tap iCloud.
3. Tap iCloud Backup.
4. Tap Back Up Now. Stay connected to your Wi-Fi network until the process ends. Under Back Up Now, you'll see the date and time of your last backup. If you get an alert that you don't have enough iCloud storage space to complete the backup, follow the onscreen steps to upgrade your iCloud storage".

How to back up your iPhone or iPad with iCloud - Apple Support

Updating your iPhone:

1. "Back up your device using iCloud or your computer.
2. Plug your device into power and connect to the internet with Wi-Fi.
3. Go to Settings > General, then tap Software Update.
4. If you see more than one software update option available, choose the one that you want to install.

The Settings app on iPhone showing options to update to iOS 15.7 or iOS 16.

5.Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do".

Update your iPhone or iPad - Apple Support

Have a good day.