How can I find out the size of a video file on my iPhone 6 camera roll?

I have created an easy and complete iOS Shortcut inspired by @nohillside.

Get the Shortcut from iCloud (no app installation is needed): https://www.icloud.com/shortcuts/642e55dc8163480a8658c3f16c9a2a65

You can find Media Metadata in the share sheet of your images/videos.

You may want to enable Allow Untrusted Shortcuts in Settings > Shortcuts

To counteract the absurd of not having the properties of video files in iPhone, search for this app in the App Store: "Video Info Viewer" from Rory Hool. It's free.

The Shortcuts app made this actually rather easy nowadays. Configure it as an extension for the share sheet, then activate it in any video (or photo) within Photos.

PS: Shortcuts is part of recent versions of iOS. For first time users it might help to have a look at the Shortcut Manual.

Another 3rd party app option is the Google Photos application. You can click a photo or video and select 'info'. It doesn't require initiating an upload and then canceling it.

I wish this was built into the native iOS Photos app, but at least Google Photos is free and comes from a reputable vendor.

Download the Photo Investigator app from the iOS App Store and select a photo, then look at the File Size at the bottom of the screen.

try to share video on utube and it will show size of video before uploading to utube. Also you can upload on icloud can also provide you the size of video. sharing it with airdrop also provide you the size of file you are sharing.

Both OneDrive and Dropbox etc. show you the file size as soon as you start to upload the video. Once you've glanced at the video size, there's nothing stopping you from cancelling the upload right away so you dont spend unnecessary data.

An option that needs no upload is the View Exif app extension - it will process the video file on your phone/iPad and tell you the size of the video and no need to leverage another service.

you can add it to an email message to check the approximate size. when you attempt to send the mail I believe it shows the size of the attached photo/video