How to share content between personal account and an organisation's account?

Can anyone give me step-by-step guide on how to share files between my personal account and my organisation's account? Whenever I try to share to my work account, it just pops up in my personal account, as they both have the same email address - I need it in the organisation's account, as that has the premium features whereas my personal account doesn't.

Any help will be much appreciated!

Thanks,

Holly