On this camera the film does not auto advance to the first frame when you shut the back cover. Once the film is inin, you then have to use the shutter release button repeatedly to advance it until the frame counter reads 1.
Here is link to a page that has a link on it, at the bottom of the page,Here is a link to download a PFDPDF of the manual.
Watch this video It. It is not in a foreign languageEnglish, but it shows the film loading process.
I know you said you looked at the user manual so iI am not sure how you missed the instructions on loading the film.
A note for all who buy used cameras.
- All of this information was easily obtained by using the internet to search for Ricoh YF-20 manual. Whenever you buy a used camera, the first thing you should do is search the internet for the manual and read it carefully.