The Solana blockchain has been developing rapidly over the past year, creating a variety of tokens. Slope will add a list of popular tokens in the community for users to search, so they can more easily manage their tokens. When Slope did not add a token, you would not find it. In any case, if you can't find it in Slope, that doesn't mean Slope doesn't support it. As long as the token complies with the chain's token standard, Slope can manage the token for you.