IP 127.0.0.1 is local to your computer. No outsider will ever be able to view that via the internet. Manager changed to a system with Customer-Portals (settings) where an email with a quote would now send a link to that portal. This only works like that on Cloud and Server Editions (latter needs valid IP / Domain name). It will thus not work on Manager Desktop.
Although the Manager internal PDF generator is no longer supported by the developer (there are many discussion on this in the forum so no need to repeat) you can still use it as per link provided by @Patch (enable in Settings → LegacyFeatures) see screenshot:
Alternatively you can in the Quote view screen click on PRINT and save as PDF that you then send using your email application.
In our business which are all plain English the legacy PDF generator works perfectly well but other language users such as Arabic have lots of problems with the legacy one and either use PRINT option or when Server / Cloud version the customer portal link.