If WhatsApp Photos and Videos are not showing up in the Photo Gallery of your iPhone, the reason is most likely due to WhatsApp not being provided with the permission to automatically download and save photos to iPhone.
In addition to this, the issue of WhatsApp photos not appearing in the Photo Gallery of an iPhone can also be caused due to lack of storage space, WhatsApp not being updated to its most recent version and WhatsApp not being allowed to access the Photo Library on your iPhone.
Related: How to Download WhatsApp Photos to Computer.
WhatsApp Media Not Showing in Photo Gallery
In most cases, the problem of WhatsApp photos not appearing in the Photo Gallery of an iPhone can be fixed by allowing WhatsApp to access the Photos App and providing it with the permission automatically download and save photos to iPhone.
If this does not help, you should be able to fix the problem by using other methods as provided below in this guide.
1. Provide WhatsApp with Access to Photo Library
WhatsApp won’t be able to save photos on iPhone, if it does not have the permission to access the Photo Library on your iPhone.
1. Open the Settings app on your iPhone.
2. From the Settings screen, go to Privacy & Security > Photos > WhatsApp.
3. On the next screen, select All Photos option.

4. After this, make sure that you Restart WhatsApp to register this change.
2. Allow WhatsApp to Save Photos on iPhone
Even if WhatsApp is provided with access to Photo Library, it won’t be able to download and save photos to iPhone, unless it is provided with the permission automatically save photos to iPhone.
1. Open WhatsApp on your iPhone.
2. Tap on your Profile Icon located in the bottom-menu and tap on Chats.

3. On the Chats screen, enable Save to Photos option by moving the slider to ON position.

This provides WhatsApp with the required permission to automatically save incoming photos and videos in Chats to the Photos Gallery on your iPhone.
3. Check Storage Status
WhatsApp won’t be able to download photos to gallery, if your iPhone is lacking in storage space. Hence, make sure that enough local storage space is available on your mobile device.
1. Go to Settings > General > iPhone Storage.
2. On the next screen, you will be able to see the amount of storage space used and available on your iPhone.

If your iPhone is lacking in storage space, you can transfer photos from your iPhone to computer and free up the storage space on your mobile device by deleting photos.
4. Clear WhatsApp Cache
Sometimes, the problem is due to a damaged or corrupted file in WhatsApp cache, preventing the display of WhatsApp images.
1. Go to Settings > General > scroll all the way down and tap on Shut Down.
2. Use the On-screen Slider to Power-off iPhone.

3. Allow iPhone to completely power-off > After 30 seconds, restart your device by pressing the Power (Side) button.
5. Update WhatsApp
Make sure that you are using the most recent version of WhatsApp is installed on your iPhone.
1. Open the App Store on your iPhone.
2. On the App Store, search for WhatsApp.
3. Tap on the Update option located next to WhatsApp Messenger.

Note: Update option will be available only if an update is available for WhatsApp.