Cannot upload more than one clip without reboot

You can upload the clips to your online vault, but remember not to make the clips any more than 30 seconds in length or it won't upload.

I have loaded some clips after more than 1 try because of this error but today after 4 hours I haven't been able to upload a 2 min clip. Trying over and over during 4 hours without success. What's the source of this error?

This is happening to me too, some more information:

Any clips I edited in the "old" Upload Studio can still be shared (through messages, activity feed, twitter and showcase).

Automatic and manual clips can be shared with no problem. GameDVR clips can be shared too.

The problem arises when editing a clip in the new Upload Studio (which is amazing by the way!)

Any clips that have been edited in Upload Studio 2.0 no longer bring up the share menu, it simply says "Something went wrong. Sorry, we are unable to share this at the moment. Try again in a while.)

The clip still uploads to the official Xbox website, and can be played just fine on there and Smartglass - but cannot be shared anywhere else. Even the third party clip websites that scrape Xbox Live can't see these Upload Studio 2.0 clips, they simply don't
exist to them - so there's definitely some kind of difference on the back-end with these new types of clips.

I've done a full cold reboot (held the power button for 10 seconds until it switched off, left it unplugged for a minute and tried again), rebooted my router, closed all other games and apps before attempting to share etc etc. Nothing works.

This happened with all clips I created yesterday and all clips I created today. We're not the only ones - at least 4 people I've spoken to on twitter have the same problem.

You can link upto 5 clips in upload, if the clips are 30 seconds or less or more then link 5 together, save it then link another 5, save it then link both of them, as long as it is no more than 5 minutes, I have managed to link 23 clips together using the
one.

I agree with you. But also with the 10 minutes per recording, you can actually make 30 minute clips with Upload Studio by just combining them. But, I wish I was able to make my videos more than 10 minutes long without having to use Upload Studio.