iOS 8 adds some storage friendly features that allow you to make sure the Messages app isn't wreaking as much havoc as it previously could. One of the ways iOS now helps you conserve storage is by letting you set video messages to automatically expire after a period of time. As we all know, video can be a huge storage hog and keeping tons of video messages in text threads can quickly eat through gigabytes of space before you know it. Here's how you can prevent it from ever happening again:
Save storage space on your iPhone or iPad by setting video messages to automatically expire
Launch the Settings app on your iPhone or iPad running iOS 8 or higher.
Tap on Messages.
Tap on Expire under the Video Messages section.
Tap on After 2 Minutes.
That's all there is to it. Keep in mind however that these settings will only apply to new video messages that are sent to you. Any videos you've already received will not be deleted unless you delete them manually.
Let me know if this tip combined with some of the other custom options Apple now offers to make the Messages app more conscious of storage space have helped you mitigate how much space it takes up overall.