METHODS 

You may use any of the following methods that best fit to your requirements, 

1.        How to Hide Photos in iPhone using HIDE OPTION of Photos Gallery

2.        How to Hide Photos in Notes App

3.        Use secure notes with your Password Manager

4.        Hide photos and videos with File Blocking App

5.       Either Consider Deleting or Safe Somewhere else these photos from your iPhone

“One who is wise enough to secure the good of others has secured his own.”

   -Chinese proverb.

1. Using HIDE OPTION of Photos Gallery

When you take a photo of his iPhone or iPad, it will be saved in your photo library along with other photos. If you frequently pick up your phone to show you pictures of your cute cat, there may be photos or videos you don't want others to see while you're browsing.

To prevent photos and videos from appearing normally in your library, learn how to hide photos using the Hidden option in the Photos app. iPhone. This will hide the photo or video from the main library view on the Photos tab. It will not be visible while browsing and will not display "For You" recommendations based on it.

Anyway, to hide photos on iPhone, follow these steps:

1. Find the photo or video you want to hide on your iPhone 

2. Tap "Share" at the top right of the iPhone or bottom left for older   versions 

3. Scroll down and tap Hide. Scroll down and tap Hide. See steps in below screen shots

Photos are now hidden. Anything you hide will appear in an album called Hidden in the Albums tab of the Photos App. Scroll to the bottom of the list and you'll see it under Other Albums

See & preform below simple steps to practice and apply 

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2.   How to Hide Photos in Notes App

Apple also includes the Notes app, and one of its distinct features is the ability to lock individual notes. This means you can add media to your note and then add a password. You can also require Face or Touch ID to unlock password-protected notes.

Also, if you lock a photo or video in a note, it is removable from your main photo library.

2.1     First Send your photo or video to Notes.

Follow below mentioned steps:

1. Find the image or video you want to hide in your note. (You can select multiple files as well.

2.Tap the share icon in the bottom left corner. 

3.Scroll through the list of apps and tap Notes. (If you don't see it, tap More and select Notes from the list of apps that appear.) 

4.Select the note in which you want to save the attachment (it will default to 'New Note') and enter a text description in the field below.

Please find below screen shots for your practice and apply on your iPhone

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2.2    Then follow the steps below to lock the created note.

1.   Open the Notes app and find the note you created (it should be at the top of the list).             

2.   Swipe left on the note title to reveal a lock icon.

3.   Lock the note by tapping the lock icon. If you've never locked your notes before, you'll be prompted to create a password and enable Face or Touch ID. This password will be used for all locked notes, so make sure you remember it or save it in your password manager. 

4.   From now on, to lock or unlock a note, tap it and authorize access using your password, facial recognition, or fingerprint.

Note 3: This method too has limitations. For example, you can't share a photo attachment for an existing locked note, even if you manually unlocked it beforehand. This makes it difficult to use one note for all hidden content.

However, you can create folders (such as "private" or "hidden") within the Notes app and place your private notes there. While not ideal, this method provides more security than Apple's insecure "hidden" albums.

Note 4: If you are using this method, don't forget to go back to your photo or video library and delete all the photos that you have hidden in the note.

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3.   Using secure notes with any Password Manager

Some applications, such as password managers, are designed with security in mind. Makes it easy to use unique credentials on the web by remembering a single master password. Most password managers also store more than passwords.

This includes, but is not limited to, banking information, scanned copies of important documents, birth certificates, and even photos and videos. This method is similar to storing private media in Notes, except using a third party app or service.

Any password manager that lets you add attachments to your notes should do the job. However, that storage may vary depending on the video content, depending on the amount of space required. As for the password manager to use, use may use these Apps such as but not limited to these only Dashlane, LastPass, Bitwarden or 1Password, or use whatever you like.

Note 5: Be aware that many password managers sync over the web, so hidden content is uploaded to the internet. Of course, it's protected with a master password. A master password is more secure than syncing with iCloud Photos or other online photo services.

 DASHLANE

LAST PASS

1PASSPWORD

BITWARDEN

4. Using File Blocking Apps

You can also use a dedicated Files app for things you want to keep private, like hide photos on your iPhone. These apps are specially designed with your privacy in mind. It offers a simple password or password lock and an area where you can store your files. Open the app, unlock it with your password or passcode, and you can access all the media stored there. Simple!

Folder Lock, Private Photo Vault, Keepsafe, Secret Apps Photo Lock are just a few of the many file locking apps available on the AppStore. Choose what you trust. Make sure it has a decent rating and doesn't block many features behind in-app purchases.

Note 6: Again, even if you use this method, keep in mind that you'll still need to delete the media you want to hide from the Photos app's main library after saving it to the Files app.

FOLDERLOCK

PRIVATE PHOTO VAULT

SECRET PHOTOS LOCK APPS

5. Deleting from your phone

& Storing Elsewhere

Instead of locking your private photos and videos on your device, consider storing them elsewhere. They may be more secure on your home computer than your phone. Therefore, if you leave your mobile phone unattended, you will not be able to find it easily.

1.   The easiest way to do this is to move them off your device. If you have a Mac, you can do this wirelessly via AirDrop.

 Find the photos you want to move, tap Share, select "AirDrop" and then select your Mac to start the transfer.

 

2.   You can also connect your iPhone or iPad to your Mac or Windows computer. Select "Trust" to authorize the device and import your pictures as you would with a digital camera.

 

MacOS Photos automatically prepares your media for import when you connect your iPhone.

 

If you have a Windows 10 computer, use the equivalent Photos app to do the same.

 

Older versions of Windows charge your iPhone as a simple removable drive, so importing your photos is easy.

 

Note 7: If you don't want to go through the trouble of importing manually, you can use Google Photos or Dropbox