I have filed provisional application in USPTO about a year ago and now have prepared non-provisional application to file in US. May I file the same application (draft) into PCT or PCT has different requirements for application?
Regarding just the mechanics - the PCT is more strict on following drawing rules and they require the PDFs in an A4 size. They will usually let you/make you fix these things later if it is clear no new matter is being added.
Application as filed with USPTO can be filed with WIPO too. The same can be filed with Receiving Office (RO) in USPTO. Structurally there is no different requirement except number of pages without extra fees. One can make changes keeping in view requirements of National phase countries and file. One will require pct-safe filing software also. Link is given below for software. All this from first hand experience. Having said that, it is always better to engage an experienced attorney if budget permits.