How come when i upload a capture to xbox live it doesn't appear on my mobile app. This...

Go to the App Store, or Google Play and download the Xbox app. You can then upload your game captures to Xbox Live, then use the mobile Xbox App to download your captures after they're uploaded to Xbox Live. You can also click on the share options for
your captures and upload them to Onedrive and use the mobile Onedrive App to download to your phone.

I believe you can download native captures from Console that are uploaded to Xbox Live via the Xbox app on mobile.

Edit: Just checked, and if it's uploaded to Xbox Live you can go to the mobile Xbox App and then click "Captures" select the capture you want to download, click the "Share" button and it has an option to "Save" in there that will download it locally.

I am on my PC, using the Xbox app on my PC. All captures recorded with the Microsoft Game DVR while playing on my PC. I can see the videos in the app under captures like usual. However, when i try to upload them to Xbox Live a message appears that says
can’t upload capture, we don’t recognize this game. The problem is now happening with Forza Horizon 4 as well. I’ve found posts suggesting trying the beta Xbox app and I was able to upload a few Forza Horizon 4 captures before the problem occured on that app
as well. The beta app wouldn’t let me upload BFV clips either. I tried resetting the regular Xbox app in the app settings and that works for awhile before the issue comes back. I’ve seen posts as old as 2016 stating this issue.

I'm having the same problem on the One S. First i thought of giving it some memory space and deleted one clip. The clip would not delete. today it shows up as a thumbnail-less clip that can't be played. I can't upload any videos, the xbox tells me it's uploading
and it tells me the clip has been uploaded to live, but when i check theres nothing there. On the mobile App I get the notification that a clip has been uploaded and I can view the clip on my phone, but if I try to share or save the clip it says a problem
occurred. As soon as I leave the clip page, it disappears from the captures tab on the app. The clip I deleted on my xbox doesn't show up on my Mobile App, thats a good thing.

This issue is new to me, before i could delete captures easily through my xbox series s. However today i cannot delete captures from live using my Xbox, the Xbox app on my phone, or through the app on my PC. It appears to delete successfully but upon a refresh every clip is back on there.

i only noticed this issue because a clip i was uploading would give a noti that it uploaded from my app but not through my xbox and when i check my uploaded files it doesnt appear. I thought it may be an issue with too many uploads so i tried deleting and soon realized Microsoft has some explaining to do.