Problems with plug-ins and purchase payment methods

How to insert a video link in the video library, instead of using youtube, but the video path link in your own server. I have read the manual, but I can’t find a solution. In terms of payment, can the administrator join the Alipay interface of China Alibaba? Many people want to buy but do not have a foreign account or Hong Kong account, please consider the administrator. I support copyright, but the payment method makes it difficult for us to support official copyright. please reply, thank you