Sieve:
{"Mail.ru_сloud":{"link":"^cloud\\.mail\\.ru/[^/]+/\\w{4}/\\w{9}\\b","res":":\nconst u='https://thumb.cloud.mail.ru/weblink/thumb/xw'\n$=JSON.parse($._.match(/cloudSettings=({.+?})<\\//)[1].replace(/\\\\x3c/g,'\\\\\\\\x3c')||'{}').params?.serverSideFolders\nreturn $?.list?$.list.map(i=>[['#'+u+'1/'+i.weblink,u+'0/'+i.weblink]]):$?.weblink?[[['#'+u+'1/'+$.weblink,u+'0/'+$.weblink]]]:''","img":"^(thumb\\.cloud\\.mail\\.ru/weblink/thumb/xw)\\d+","to":"#$11\n$10"}}

uBo rule:
cloud.mail.ru##.js-public-height.Public-desktop__rightCol--vLyHP