I asked this on https://community.postman.com/t/postman-proxy-does-not-save-urls-of-some-resources/19376, but no answers this far.
I’ve turned on Postman Proxy and configured Firefox (Tools -> Options -> Network, Settings, then Manual configuration of proxy servers) to use 127.0.0.1, port 5555. I can see that it works at least to some extent, because the actual URLs of addresses entered in the Firefox address bar show up in Postman (in the collection created for this purpose). I’m not sure if Postman should gather the all children URLs (that is, the URLs that are visible in the browser after pressing F12 -> Network), though - and my question is: should it? I’m confused because some (few) URLs does show up in the collection, but other do not.
I put the screenshot showing the situation so possibly it could be easier to figure out what is my point (the URL of the loaded page: http://www.kociesprawy.pl/magazyn/czytelnia_artykuly_w_kocich_sprawach/koty_i_ludzie/kocie_blogi_-_w_krainie_pieciu_kotow/).
After loading the above mentioned page in Firefox, I can see that, for example, the file koty-1.jpg is downloaded. Nothing like that in the collection. I've tried to figure this out on my own using screenshots, videos and so on, but I can't unequivocally settle this.
Edit: PDHide (so perhaps others too) supposed that I confused settings of how Postman's requests should be proxied with Postman built-in proxy for capturing the requests. In fact I didn't, I've configured what he has shown on the screenshot, but with the difference that I save resources to a collection, not to the history. If you want to confirm if in your case this Postman capturing function works as in mine, then you can just do the instructions https://learning.postman.com/docs/sending-requests/capturing-request-data/capturing-http-requests/ "Step 1: Set up the proxy in Postman" but setting saving to a collection, configure Firefox to make requests to port 5555 and then just make request to http://www.kociesprawy.pl/magazyn/czytelnia_artykuly_w_kocich_sprawach/koty_i_ludzie/kocie_blogi_-_w_krainie_pieciu_kotow/ and check the collection.