Oh ok. So your portfolio website is a webflow site and on that webflow site you want to realtime show those other projects that were not built in webflow? In that case you can indeed clip them (video, img, lottie) on your webflow portfolio and host those clips on webflow.
But if you want those external projects to be visited live, you need to host them somewhere separate. XSS/phishing protection in modern browsers will halt your iFrame loading of an external website. There might be some l33t hax around that, but I wouldn’t waste production time fighting the webkit devs for exploitable bugs 
Those are the guys that write the books on browser building.