This app was mentioned in 8 comments, with an average of 2.13 upvotes
If you use Android you can download this app from Google Play. You connect your Gamertag and then can download your clips directly to your phone. If you use an iPhone or don't like the app I linked you can upload your clips from your Xbox onto OneDrive and then use the OneDrive app on your phone to download them.
you can use "DVR Hub for Xbox" APP which can share your xbox one`s screenshot and game clip to FB/Twitter/Youtube etc by both android mobile and windows 10 /mobile.
[windows 10/mobile] https://www.microsoft.com/en-us/store/p/dvr-hub-for-xbox/9nk0qlbv5ggm#
[android] https://play.google.com/store/apps/details?id=com.room408design.XboxDVRHub
on Xbox
If Auto-Upload is off: Click the Upload option or Cloud icon while watching the capture then Upload to Xbox Live / OneDrive.
If your captures are Public (Privacy Settings - https://account.xbox.com/en-US/Settings) Xbox Live captures can be accessed at:
If they are Private they can only be accessed from the official Activity Feed or Xbox apps:
* https://account.xbox.com/en-us/Profile?xr=mebarnav&rtc=1
* Xbox app (Android, iOS, Windows)
If uploaded to OneDrive:
The Share option allows you to share to Twitter or OneDrive.
If captures are turned off or you want to change resolution:
On the Xbox console > Settings > Preferences > Broadcast & capture
You will have the following options:
Allow game captures.
Default duration.
Automatically upload.
Game clip resolution.
Capture location.
So there really is no excuse for low-resolution RDR2 captures!
If your captures are Public (Privacy Settings - https://account.xbox.com/en-US/Settings) Xbox Live captures can be accessed at:
If they are Private they can only be accessed from the official Activity Feed or Xbox apps:
If uploaded to OneDrive:
Download your video using one of those methods then share it in Snapchat. I do it all the time; the quickest way is using the DVR Hub app.
Xbox DVR Hub makes this pretty easy
https://play.google.com/store/apps/details?id=com.room408design.XboxDVRHub