Well, sometimes you can find the My Hammer manhwa on dedicated manga and manhwa forums. Also, check out some online bookstores that specialize in comics and graphic novels. But make sure to use legal and authorized sources.
Possibly, it's a technical glitch. Sometimes, apps have temporary issues that prevent certain sharing functions. Try again later or update the app to see if that fixes it.
You can start by checking popular manga aggregator websites. Sometimes, they have links to the raw version. Another option is to follow the official social media accounts related to the manhwa, they might give hints on where to find it. But keep in mind, accessing raw versions from unauthorized sources might violate copyright laws.
You might try looking on some specialized manga or manhwa websites that are known for hosting uncensored content. But be careful as some of these sites might not be legal or safe.
I think your best bet would be to search on obscure manga aggregator sites. However, make sure you're accessing legal and trusted sources. Another option could be reaching out to manhwa fan communities and asking for their suggestions.