Uploading page by page is easy and allows you to correct any page order mistakes as you go. (writing.ie)
If you have done it right, you will have no header or footer on the first page of the chapter but those should be in place after that page, complete with correct page numbers. (madgeniusclub.com)
The burden of proof does rest on the publisher to show that they have permission, which could be in the form of letters saying that a work was to be published in some compilation; corrected page proofs; and various other ways of signalling agreement. (law.stackexchange.com)