Sideloading Large App through Device Portal or Visual Studio to Xbox One keeps failing... Why?

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I have an app which is ~20GB all in all. I'm trying to sideload this to the Xbox One, which I have previously achieved with smaller apps via Visual Studio or the Device Portal.

However, with the big app, I get this error:

Error       OperationFailedException: Error HRESULT E_FAIL has been returned from a call to a COM component     

about six times, in the output.

On device portal it just stops after about 20% progress, giving no reason as to why.

Does anyone have any ideas as to why this is happening? I assume it is the size, but then, how would companies test their games?

Any help would be great.

Thanks in advance!

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It turns out that theres a default limit on Dev storage, set to 5GB. This was the issue, you can change this by pressing the options button and selecting 'Manage Dev Storage'. Bit daft that it fails with an irrelevant error when the space is exceeded but that's the way it is. Problem solved once I'd expanded to 30GB.