Hello. I have a website that is not responsive and instead use m.example.com as a mobile version. While you can basically do same stuff on both versions of the website, when it comes to content, there are radical differences.

m.example.com has much richer textual content compared to the desktop version. I have set up a canonical and alternate tags and now wondering if I should create separate sitemap for the mobile version?

Should or shouldn't rank, that's one thing. But are you in the SERP at all?

If yes - it's not an issue with indexing - your site is already indexed and it's a matter of ranking.

No that won't do. So the page in question has around 25-35k visitors each day with good authority. I had very specific keywords in this language and it was ranking just fine. But 2 days ago it lost index and when I submitted reindexing, it indexed without content. This is not a new page that's not being indexed, but already existing one with very good rankings.

Hello,

I have a problem of page indexing without content. I have website in 3 different languages and 2 of the pages are indexing just fine, but one language page (the most important one) is indexing without content. When searching using site: page comes up, but when searching unique keywords for which I should rank 100% nothing comes up.