Error failed to initialize when uploading saved world to new realm

Does this happen every time?
What device are you using?
How large is the world you are trying to upload?
Is the world a plain vanilla world, or does it have any add-ons, or created from a template, etc?
Please attach a screenshot showing the error message.

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its just a regular world with a texter pack cromahills its 133 something mb and there is just says erro there was a error and shows no progress bar when initalizing upload I cannot get a screen shot because xbox wont show me my screenshots and is out of date from like years ago I dont know whats wrong with the screenshot stuff xbox has really gone downhill last few years.