This is a test[^1] for footnote with numeral[^2], but in certain text part[^3] we need concatenated refs, for example here with all footnotes [¹][²][³][⁴]
[^1]: [first footnote](...)
[^2]: [second footnote]()
[^3]: [third footnote]()
[^4]: [fourth footnote]()
I don’t know what you mean by this, but it looks like you can have multiple footnotes in a row if you use the syntax. Your example uses [¹][²][³][⁴] but needs to be [^1][^2][^3][^4].
I don’t know for sure of this support is intended. Obsidian’s Markdown spec doesn’t say, and I don’t know offhand where they borrowed the syntax from. (It’s not from GitHub Flavored Markdown, which is where they got some other Markdown extensions from).