YouTube?

[Romulator]

May also be because of your location in the world. Many countries have certain laws that May or may not affect the upload and/or sharing of such videos or content related to or about video game LPs, reviews or contains footage of such material.

It could also be the file's name which could be raising some questions, or the name you give it on YouTube may be similar to another name already on there.

If you're in the USA, one of the options in a drop box talks about where your position is in your video in terms of your rights and ownership. Adjusting these may also affect the upload.